Magnetic dipole moment of a rectangular loop is
|
(a) Inversely proportional to current in loop |
|
(b) Inversely proportional to area of loop |
|
(c) Parallel to plane of loop and proportional to area of loop |
|
(d) Perpendicular to plane of loop and proportional to area of loop |
(d) Perpendicular to plane of loop and proportional to area of loop
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$\frac{1}{2}\text{kx}^2$
$-\frac{1}{2}\text{kx}^2$
$\frac{1}{4}\text{kx}^2$
$-\frac{1}{4}\text{kx}^2$
Assertion : Reduction factor (K) of a tangent galvanometer helps in reducing deflection to current.
Reason : Reduction factor increases with increase of current.
|
(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 lens of focal power 0.5 D is
|
(a) A convex lens of focal length 0.5 m |
|
(b) A concave lens of focal length 0.5 m |
|
(c) A convex lens of focal length 2 m |
|
(d) A concave lens of focal length 2 m |
Basically, the product modulator is
|
(a) An amplifier |
(b) A mixer |
|
(c) A frequency separator |
(d) A phase separator |
A storage battery has e.m.f. 15 volts and internal resistance 0.05 ohm. Its terminal voltage when it is delivering 10 ampere is
|
(a) 30 volts |
(b) 1.00 volts |
(c) 14.5 volts |
(d) 15.5 volts |
Two different coils have self-inductance 
,
. The current in one coil is increased at a constant rate. The current in the second coil is also increased at the same rate. At a certain instant of time, the power given to the two coils is the same. At that time the current, the induced voltage and the energy stored in the first coil are 
and 
respectively. Corresponding values for the second coil at the same instant are 
and 
respectively. Then
|
(a) |
(b) |
(c) |
(d) a, b, c |
