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Physics M.C.Q (1 Marks)

Moving Charges and Magnetism · CBSE STD 12 Science (CBSE - English Medium). 30 questions.

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M.C.Q (1 Marks)

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30 questions · timed · auto-graded

MCQ 11 Mark
When a charged particles moves in a uniform magnetic field in a direction perpendicular to the field, then the path of the particle will be:
  • ✓
    Perabolic
  • B
    Circular
  • C
    Straight line
  • D
    Helical
Answer
Correct option: A.
Perabolic
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MCQ 21 Mark
Moving charge produces:
  • A
    Only electric field
  • B
    Only magnetic field
  • ✓
    Both electric and magnetic field
  • D
    Electromagnetic waves along with electric and magnetic field
Answer
Correct option: C.
Both electric and magnetic field
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MCQ 31 Mark
The toroid of radius $10 \ cm$ has $100$ turns. If a current of $0.1$ ampere is flowing in it, then the value of the magnetic field on the axis of the toroid will be:
  • ✓
    $2 \times 10^{-4} T$
  • B
    $4 \times 10^{-4} T$
  • C
    $6 \times 10^{-4} T$
  • D
    $8 \times 10^{-4} T$
Answer
Correct option: A.
$2 \times 10^{-4} T$
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MCQ 41 Mark
An electron moves with a constant velocity $v$ in a uniform magnetic field $B,$ parallel to the direction of the magnetic field. The force acting on electron is:
  • ✓
    zero
  • B
    $Bev$
  • C
    $\frac{ B }{e v}$
  • D
    $\frac{Be}{v}$
Answer
Correct option: A.
zero
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MCQ 51 Mark
A moving coil galvanometer can be converted into voltmeter by:
  • A
    joining high resistor in parallel
  • B
    joining low resistor in series
  • ✓
    joining high resistor in series
  • D
    joining low resistor in parallel
Answer
Correct option: C.
joining high resistor in series
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MCQ 61 Mark
Relation between current $I$ flowing in moving coil galyanometer and deflection $\theta$ is :
  • A
    $I \propto \tan \theta$
  • ✓
    $I \propto \theta$
  • C
    $I=\frac{1}{\theta}$
  • D
    $1 \propto \cot \theta$
Answer
Correct option: B.
$I \propto \theta$
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MCQ 71 Mark
The reason for attractive force between two parallel wires in which current is flowing in same direction is:
  • A
    electromotive force between them
  • B
    mutual inductance between them
  • C
    electric force between them
  • ✓
    magnetic force between them
Answer
Correct option: D.
magnetic force between them
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MCQ 81 Mark
To convert a moving coil galvanometer into voltmeter
  • A
    a low resistor is needed to join in parallel
  • B
    a low resistor is needed to join in series
  • C
    a high resistor is needed to join in parallel
  • ✓
    a high resistor is needed to join in series
Answer
Correct option: D.
a high resistor is needed to join in series
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MCQ 91 Mark
Two independent parallel wires in which the current is flowing in the same direction. They will:
  • ✓
    attract each other
  • B
    repel each other
  • C
    not exert any force on each other
  • D
    current in one of the wire vanishes
Answer
Correct option: A.
attract each other
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MCQ 101 Mark
Magnitude of produced magnetic field at any point inside a solenoid depends on:
  • A
    only on the current flowing in the solenoid
  • B
    only on the length of the solenoid
  • C
    on the number of turns
  • ✓
    all of the above
Answer
Correct option: D.
all of the above
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MCQ 111 Mark
Current is flowing in two parallel good conducting wires in the same direction. They will
  • A
    attract each other
  • B
    repel each other
  • ✓
    not exert any force
  • D
    be perpendicular to each other
Answer
Correct option: C.
not exert any force
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MCQ 121 Mark
Nature of electron beam travelling in same direction with same velocity is:
  • A
    convergent
  • B
    divergent
  • ✓
    parallel
  • D
    cannot say
Answer
Correct option: C.
parallel
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MCQ 131 Mark
In an area of constant magnetic field, a charged particle enters in a direction parallel to the direction of magnetic field with its velocity. The speed of particle is:
  • ✓
    straight linear path
  • B
    coil path
  • C
    circular path
  • D
    large circular path
Answer
Correct option: A.
straight linear path
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MCQ 141 Mark
Two long straight wires are kept parallel, distance between them is 2R and current is flowing in opposite directions in two wires. The magnitude of magnetic field at a point midway between them which is at a distance R from each wire is:
  • A
    zero
  • B
    $\frac{\mu_0 I }{4 \pi R }$
  • C
    $\frac{\mu_0 I}{2 \pi R}$
  • ✓
    $\frac{\mu_0 I }{\pi R }$
Answer
Correct option: D.
$\frac{\mu_0 I }{\pi R }$
(d)$\frac{\mu_0 I }{\pi R }$
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MCQ 151 Mark
Current I is flowing in a wire of infinite length. Magnetic field is B at a perpendicular distance r from the wire. The correct relation is:
  • A
    $B \propto \frac{ I }{r^2}$
  • ✓
    $B \propto \frac{ I }{r}$
  • C
    $B \propto \frac{ I }{r^3}$
  • D
    $B \propto \frac{ I }{\sqrt{r}}$
Answer
Correct option: B.
$B \propto \frac{ I }{r}$
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MCQ 161 Mark
Direction of magnetic field at any point due to a long current carrying conductor is:
  • A
    parallel to the current
  • B
    opposite to the current
  • C
    sine outwards
  • ✓
    perpendicular to the line joining the conductor and the point according to right hand palm rule
Answer
Correct option: D.
perpendicular to the line joining the conductor and the point according to right hand palm rule
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MCQ 171 Mark
Magnetic field in a current carrying solenoid is B. If length of the solenoid and current flowing through the solenoid is doubled, keeping the number of turns same, the magnitude of magnetic field in the solenoid will be:
  • A
    B
  • ✓
    2B
  • C
    $\frac{B}{4}$
  • D
    4B
Answer
Correct option: B.
2B
(b)2B
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MCQ 181 Mark
A constant current is flowing through a long straight conductor, then the graph showing change in produced magnetic field B with distance r is:
  • A
    Image
  • B
    Image
  • C
    Image
  • ✓
    Image
Answer
Correct option: D.
Image
(d)Image
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MCQ 191 Mark
Magnitude of intensity of magnetic field at the center of any circular current carrying conductor is:
  • A
    minimum
  • B
    only proportional to current
  • ✓
    maximum
  • D
    proportional to radius
Answer
Correct option: C.
maximum
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MCQ 201 Mark
$ 1 \text { Tesla = } $ $\qquad$ Gauss
  • A
    $10^7$
  • B
    $10^-4$
  • ✓
    $10^4$
  • D
    $10^-7$
Answer
Correct option: C.
$10^4$
(c )$10^4$
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MCQ 211 Mark
Same current is flowing through two parallel conducting wires at a distance $d$ in opposite directions. The intensity of magnetic field at the midpoint between the wires is :
  • A
    $\frac{\mu_{ o } i}{2 \pi d}$
  • ✓
    $\frac{2 \mu_0 i}{\pi d}$
  • C
    $\frac{\mu_0 i}{\pi d^2}$
  • D
    zero
Answer
Correct option: B.
$\frac{2 \mu_0 i}{\pi d}$
(b)$\frac{2 \mu_0 i}{\pi d}$
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MCQ 221 Mark
Correct mathematical form of Ampere's rule is:
  • A
    $\oint B \cdot d l=\Sigma i$
  • ✓
    $\oint H \cdot d l=\Sigma i$
  • C
    $\oint B d l=\frac{\Sigma i}{\mu_{ o }}$
  • D
    $\oint H d l=\mu_{ o } \Sigma i$
Answer
Correct option: B.
$\oint H \cdot d l=\Sigma i$
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MCQ 231 Mark
Magnitude of magnetic field for a definite cross$-$section of a current carrying toroid is:
  • A
    same on entire area of cross-section
  • B
    maximum on outer end
  • ✓
    maximum on inner end
  • D
    maximum at the center of cross-sectional cut
Answer
Correct option: C.
maximum on inner end
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MCQ 241 Mark
In a solenoid, the magnetic field produced due to flow of current $i$ is $B$. The current required to obtain same magnetic field on doubling the length and number of turns in the solenoid is :
  • A
    $2 i$
  • ✓
    $ i$
  • C
    $\frac{i}{2}$
  • D
    $\frac{i}{4}$
Answer
Correct option: B.
$ i$
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MCQ 251 Mark
Current of 1 A is flowing through two parallel wires in the same direction and distance between the wires is 1 m . The mutual attractive force at unit length will be :
  • ✓
    $2 \times 10^{-7} Nm ^{-1}$
  • B
    $4 \times 10^{-7} Nm ^{-1}$
  • C
    $8 \times 10^{-7} Nm ^{-1}$
  • D
    $10^{-7} Nm ^{-1}$
Answer
Correct option: A.
$2 \times 10^{-7} Nm ^{-1}$
(a)$2 \times 10^{-7} Nm ^{-1}$
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MCQ 261 Mark
A coil of one loop is made from a wire of length $L$ and after that a coil of 2 loops is made from the same wire. The ratio of magnetic fields at the center is :
  • ✓
    1: 4
  • B
    1: 1
  • C
    1: 8
  • D
    4: 1
Answer
Correct option: A.
1: 4
(a)1: 4
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MCQ 271 Mark
Due to a current carrying circular coil of radius $R$, intensity of magnetic field on its axis at a distance $x(x \gg R )$, B will depend on $x$ :
  • A
    $B \propto \frac{1}{x^{\frac{3}{2}}}$
  • B
    $B \propto \frac{1}{x^2}$
  • ✓
    $B \propto \frac{1}{x^3}$
  • D
    $B \propto \frac{1}{x^{\frac{1}{2}}}$
Answer
Correct option: C.
$B \propto \frac{1}{x^3}$
(c )$B \propto \frac{1}{x^3}$
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MCQ 281 Mark
Same current is flowing through two identical coils. Their centers are common and their planes are mutually perpendicular. Magnetic field at the center due to one coil is B then the resultant magnetic field at the common center is :
  • A
    Zero
  • B
    $\frac{ B }{\sqrt{2}}$
  • ✓
    $\sqrt{2} B$
  • D
    2 B
Answer
Correct option: C.
$\sqrt{2} B$
(c )$\sqrt{2} B$
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MCQ 291 Mark
Magnetic field produced at the center of a circular coil due to current flowing in it is $B _0$. On axial point of same coil, a point at a distance equal to its radius is B , then the ratio $\frac{ B _0}{B}$ is :
  • A
    $\sqrt{2}: 1$
  • ✓
    $2 \sqrt{2}: 1$
  • C
    $1: 2 \sqrt{2}$
  • D
    $1: \sqrt{2}$
Answer
Correct option: B.
$2 \sqrt{2}: 1$
(b)$2 \sqrt{2}: 1$
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MCQ 301 Mark
An electron rotating in a circular path of radius r making n revolutions per second. Magnetic moment of electron will be:
  • A
    Zero
  • ✓
    $\pi r^2 n e$
  • C
    $\pi r^2 n^2 e$
  • D
    $\frac{\mu_0 r^2 n e}{2 \pi}$
Answer
Correct option: B.
$\pi r^2 n e$
(b)$\pi r^2 n e$
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