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A current $i$ ampere flows in a circular arc of wire whose radius is $R$ , which subtend an angle $\frac{3 π}{2}$ radian at its centre. The magnetic induction $B$ at the centre is

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Important Questions on Magnetic Effects of Current

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JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 58

The strength of the magnetic field at a distance

r

near a long straight current-carrying wire is

B

. The field at a distance

\frac{r}{2}

will be

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 59

A current of

0.1 A

circulates around a coil of

100

turns and having a radius equal to

5 cm

. The magnetic field set up at the centre of the coil is

(μ_{0} = 4 π \times 10^{- 7} Wb A m^{- 1})

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 60

In the figure shown there are two semicircles of radii $r_{1}$ and $r_{2}$ in which a current $i$ is flowing. The magnetic induction at the centre $O$ will be

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 61

A particle carrying a charge equal to

100

times the charge on an electron is rotating one rotation per second in a circular path of radius

0.8 m

. The value of the magnetic field produced at the centre will be (

μ_{0} =

permeability for vacuum)

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JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 62

In hydrogen atom, an electron is revolving in the orbit of radius

0.53 \overset{o}{A}

with

6.6 \times 10^{15} rps

. Magnetic field produced at the centre of the orbit is

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JEE Advanced

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 63

A battery is connected between two points

A

and

B

on the circumference of a uniform conducting ring of radius

r

and resistance

R

. One of the arcs

A B

of the ring subtends an angle

θ

at the centre. The value of the magnetic induction at the centre due to the current in the ring is

MEDIUM

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 64

An arc of a circle of radius

R

subtends an angle

\frac{π}{2}

at the centre. It carries a current

i

. The magnetic field at the centre will be

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JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 65

Which of the following gives the value of the magnetic field due to a small current element according to Biot-Savart's law?

A current i ampere flows in a circular arc of wire whose radius is R, which subtend an angle 3π2 radian at its centre. The magnetic induction B at the centre is

Important Questions on Magnetic Effects of Current

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A current $i$ ampere flows in a circular arc of wire whose radius is $R$ , which subtend an angle $\frac{3 π}{2}$ radian at its centre. The magnetic induction $B$ at the centre is