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A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is $B .$ It is the n bent into a circular loop of $n$ turns. The magnetic field at the centre of the coil will be

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Important Questions on Electromagnetism

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 8 - Electromagnetism>EXERCISE 8>Q 15

A straight conductor of length

l

carrying a current

I

, is bent in the form of a semicircle. The magnetic field (in tesla) at the centre of the semicircle is

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 8 - Electromagnetism>EXERCISE 8>Q 16

In the figure Fig. $8.120$ show, the magnetic field induction at the point $O$ will be

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 8 - Electromagnetism>EXERCISE 8>Q 17

A current I flows along the length of an infinitely long, straight thin walled pipe. Then

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 8 - Electromagnetism>EXERCISE 8>Q 18

A long straight wire of radius

a

carries steady current

i .

The current is uniformly distributed across its cross-section. The ratio of the magnetic field at

\frac{a}{2}

and

2 a

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 8 - Electromagnetism>EXERCISE 8>Q 19

A straight wire of mass

200 g m

and length

1.5

m

carries current of

2 A .

It is suspended in mid-air by a uniform horizontal magnetic field

B

. The magnitude of

B .

(in tesla) is

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 8 - Electromagnetism>EXERCISE 8>Q 20

Current I is flowing in conductor shaped as shown in the figure, Fig. $8.121 .$ The radius of the curved path is $r$ and the length of the straight portion is very large. The value of the magnetic field at the centre $O$ will be

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 8 - Electromagnetism>EXERCISE 8>Q 21

A horizontal overhead power line is at a height of

4 m

from the ground and carries a current of

100 A

from east to west. The magnetic field directly below it on the ground is

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

HARD

12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 8 - Electromagnetism>EXERCISE 8>Q 22

Two long parallel wires carry currents

i_{1}

and

i_{2}

such that

i_{1} > i_{2} .

When the currents are in the same direction, the magnetic field at a point midway between the wires is

6 \times 10^{- 6} T .

If the direction of

i_{2}

is reversed, the field becomes

3 \times 10^{- 5} T .

The ratio of

\frac{i_{1}}{i_{2}}

A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is B. It is the n bent into a circular loop of n turns. The magnetic field at the centre of the coil will be

Important Questions on Electromagnetism

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A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is $B .$ It is the n bent into a circular loop of $n$ turns. The magnetic field at the centre of the coil will be