A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 8 - Electromagnetism>EXERCISE 8>Q 13

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In a hydrogen atom, the electron is making $6.6 \times 10^{15} rps$ in a circular path of radius $53 Å$ . What is the magnetic induction produced at the centre of the orbit ?

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Important Questions on Electromagnetism

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 8 - Electromagnetism>EXERCISE 8>Q 14

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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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

is

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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})