Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 11

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Magnetic field at the centre $O$ due to the given structure 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 12

A current

i

flows in a thin wire in the shape of a regular polygon with

n

sides. The magnetic induction at the centre of the polygon when

n \to \infty

is (

R

is the radius of its Circumcircle)

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 13

Two long straight wires are placed along

x

-axis and

y

-axis. They carry current

I_{1}

and

I_{2}

respectively. The equation of locus of zero magnetic induction in the magnetic field produced by them is

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 14

Surface charge density on a ring of radius a and width $d$ is $σ$ as shown in the figure. It rotates with frequency $f$ about its own axis. Assume that the charge is only on outer surface. The magnetic field induction at centre is (Assume that $d ≪ a$ )

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 15

A current of

i

ampere is flowing in an equilateral triangle of side

a .

The magnetic induction at the centroid will be

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 16

The magnetic field intensity at the point $O$ of a loop with current $i,$ whose shape is illustrated below is

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 17

A square frame of side

1 m

carries a current

I

, produces a magnetic field

B

at its centre. The same current is passed through a circular coil having the same perimeter as the square. The magnetic field at the centre of the circular coil is

B^{'}

. The ratio

\frac{B}{B^{'}}

is

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

A charge $Q$ moves parallel to a very long straight wire carrying a current / as shown. The force on the charge is

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

A uniform conducting wire $A B C$ has a mass of $10 g .$ A current of $2 A$ flows through it. The wire is kept in a uniform magnetic field $B = 2 T .$ The acceleration of the wire will be