The magnetic induction at a point P which is distant 4 cm from a long current carrying wire is 
. The field of induction at a distance 12 cm from the same current would be
|
(a) 3.33 |
(b) 1.11 |
(c) 3 |
(d) 9 |
(a) 3.33 
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Two slits, 4 mm apart, are illuminated by light of wavelength 6000 Å. What will be the fringe width on a screen placed 2m from the slits
|
(a) 0.12 mm |
(b) 0.3 mm |
(c) 3.0 mm |
(d) 4.0 mm |
A light bulb is placed between two plane mirrors inclined at an angle of 60°. The number of images formed are
| (a) 6 | (b) 2 | (c) 5 | (d) 4 |
Intensity of X-rays depends upon the number of
|
(a) Electrons |
(b) Protons |
(c) Neutrons |
(d) Positrons |
Assertion : When two coils are wound on each other, the mutual induction between the coils is maximum.
Reason : Mutual induction does not depend on the orientation of the coils.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
A 10 
capacitor and a 20 capacitor are connected in series across a 200 V supply line. The charged capacitors are then disconnected from the line and reconnected with their positive plates together and negative plates together and no external voltage is applied. What is the potential difference across each capacitor
|
(a) |
(b) |
(c) 400 V |
(d) 200 V |
The characteristic X-ray radiation is emitted, when
| (a) The electrons are accelerated to a fixed energy |
| (b) The source of electrons emits a monoenergetic beam |
|
(c) The bombarding electrons knock out electrons from the inner shell of the target atoms and one of the outer electrons falls into this vacancy |
|
(d) The valence electrons in the target atoms are removed as a result of the collision |
A wire of resistance 10 W is bent to form a circle. P and Q are points on the circumference of the circle dividing it into a quadrant and are connected to a Battery of 3 V and internal resistance 1 W as shown in the figure. The currents in the two parts of the circle are
|
(a) |
(b) |
|
(c) |
(d) |
The force between the plates of a parallel plate capacitor of capacitance C and distance of separation of the plates d with a potential difference V between the plates, is
|
(a) |
(b) |
(c) |
(d) |
If the magnetic flux is expressed in weber, then magnetic induction can be expressed in
|
(a) Weber/m2 |
(b) Weber/m |
(c) Weber-m |
(d) Weber-m2 |
