Gamma Question Bank for Engineering Physics>Chapter 18 - Moving Charges and Magnetism>Assignment>Q 41

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A ring carrying current $I$ lies in $x - z$ plane as shown. A short magnetic dipole with dipole moment directed along $x$ -axis is fixed at origin. If the ring is free to move anywhere, then it will

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Important Questions on Moving Charges and Magnetism

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Gamma Question Bank for Engineering Physics>Chapter 18 - Moving Charges and Magnetism>Assignment>Q 42

Two galvanometers

A

and

B

require

3 mA

and

5 mA

respectively to produce the same deflection of

10

division then

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Gamma Question Bank for Engineering Physics>Chapter 18 - Moving Charges and Magnetism>Assignment>Q 43

Sensitivity of a moving coil galvanometer can be increased by:

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Gamma Question Bank for Engineering Physics>Chapter 18 - Moving Charges and Magnetism>Assignment>Q 44

The restoring couple in the moving coil galvanometer is due to

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Gamma Question Bank for Engineering Physics>Chapter 18 - Moving Charges and Magnetism>Assignment>Q 45

In an attempt to increases the current sensitivity of a moving coil galvanometer, it is found that its resistance becomes double while the current sensitivity increases by

10 %

. The voltage sensitivity of the galvanometer changes by

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Gamma Question Bank for Engineering Physics>Chapter 18 - Moving Charges and Magnetism>Assignment>Q 46

Value of $r$ for which magnetic field at point $P$ on the axis of a circular current carrying loop of radius $a$ is maximum as shown in figure ______

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Gamma Question Bank for Engineering Physics>Chapter 18 - Moving Charges and Magnetism>Assignment>Q 47

A particle of mass

m

and charge

q

moving with velocity

v

along the positive

x

-direction. It enters a region of uniform magnetic field

B

directed along the negative

z

-axis, extending from

x = a

to

x = b

. If minimum value of

v

required so that the particle may enter the region of

x > b

is

\frac{2 q (b - a) B}{N m}

, then value of

N

is

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Gamma Question Bank for Engineering Physics>Chapter 18 - Moving Charges and Magnetism>Assignment>Q 48

Two current carrying loops of radius

R

and

2 R

carrying current

I

and

2 I

respectively are placed concentrically with their planes at right angle. If magnitude of resultant magnetic field at the centre is

\frac{μ_{0} I}{2 R} \sqrt{N}

, then value of

N

is _____.

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Gamma Question Bank for Engineering Physics>Chapter 18 - Moving Charges and Magnetism>Assignment>Q 49

Magnetic field at $O$ of a loop of uniform resistance per unit length is ______

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