Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 19

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The figure below shows a current loop having two circular arcs joined by two radial lines. The magnetic field at $O$ is

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Important Questions on Moving Charges and Magnetism

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 20

The radius of a circular current carrying coil is

R .

At what distance from the centre of the coil on its axis, the intensity of magnetic field will be

\frac{1}{2 \sqrt{2}}

times that at the centre?

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 21

A thin disc of radius

R

and mass

M

has charge

q

uniformly distributed on it. It rotates with angular velocity

ω .

The ratio of magnetic moment and angular momentum for the disc is

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 22

The number of turns per unit length of a long solenoid is

10 .

If its average radius is

5 cm

and it carries a current of

10 A,

then the ratio of flux densities obtained at the centre and at the end on the axis will be

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 23

In a toroid the number of turns per unit length is

1000

and current through it is

\frac{1}{4 π}

ampere. The magnetic field produced inside

(in \frac{weber}{m ²})

will be

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 24

A conducting circular loop of radius

r

carries a constant current i. It is placed in a uniform magnetic field

B

such that

B

is perpendicular to the plane of the loop. The magnetic force acting on the loop is

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 25

A circular loop of radius $R$ is kept in a uniform magnetic field pointing perpendicular into the plane of paper. When a current I flows in the loop, the tension produced in the loop is

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 26

If two straight current carrying wires are kept perpendicular to each other almost touching, then the wires

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 27

Connecting wires carrying currents in opposite directions are twisted together in using electrical appliances in order to reduce