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The figure shows a circular loop with radius $r$ . The resistance of arc $A B C$ is $5 Ω$ and that of $A D C$ is $10 Ω$ . The magnetic field at the centre of the loop is,

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Important Questions on Magnetic Effect of Current

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IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Previous Year Questions)>Q 3

Radius of current carrying coil is ’R’. If fractional decreases in field value with respect to centre of the coil for a near by axial point is 1% then find axial position of that point.

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Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Previous Year Questions)>Q 4

A solid cylindrical wire of radius

R

carries a current

I

. The ratio of magnetic fields at points which are located at

\frac{R}{2}

and

2 R

distance away from the axis of the wire is,

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Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Previous Year Questions)>Q 5

A solid cylindrical wire of radius

R

carries a current

I

. The magnetic field is

5 μ T

. At a point which is

2 R

distance away from the axis of wire, the magnetic field at a point which is

\frac{R}{3}

distance inside from the surface of the wire is,

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Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Previous Year Questions)>Q 6

A hollow cylindrical wire carries a current

I

having inner and outer radii

R

and

2 R

, respectively. The magnetic field at a point which is

\frac{3 R}{2}

distance away from its axis is,

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Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Previous Year Questions)>Q 7

A long, straight, solid metal wire of radius

2 mm

carries a current uniformly distributed over its circular cross-section. The magnetic field induction at a distance

2 mm

from its axis is

B

. Then, the magnetic field induction at distance

1 mm

from axis will be,

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Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Previous Year Questions)>Q 8

A long straight wire (radius

= 3.0 mm

) carries a constant current distributed uniformly over a cross-section perpendicular to the axis of the wire. If the current density is

100 A m^{- 2}

, the magnitudes of the magnetic field at

(a)

2.0 mm

from the axis of the wire and

(b)

4.0 mm

from the axis of the wire is,

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Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Previous Year Questions)>Q 9

State whether the following statement is true or false.
The magnetic field inside a straight solenoid of finite length is always less than

μ_{0} n i

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IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise (Previous Year Questions)>Q 10

State whether the following statement is true or false.
The magnetic field of an infinitely long ideal solenoid of radius

R

carrying current

I

is constant inside and zero outside.

The figure shows a circular loop with radius r. The resistance of arc ABC is 5 Ω and that of ADC is 10 Ω. The magnetic field at the centre of the loop is,

Important Questions on Magnetic Effect of Current

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The figure shows a circular loop with radius $r$ . The resistance of arc $A B C$ is $5 Ω$ and that of $A D C$ is $10 Ω$ . The magnetic field at the centre of the loop is,