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To measure the field 'B' between the pol...

To measure the field `'B'` between the poles of an electronmagnet, a small test loop of area `1 cm^(2)`, resistance `10 Omega` and `20` turns is pulled out of it. A galvanometer shows that a total charge `2mu C` passed through the loop. The value of `'B'` is

A

0.001 T

B

0.01 T

C

0.1 T

D

1.0 T

Text Solution

Verified by Experts

The correct Answer is:
B
`q=e/Rdt=((B_1-B_2)NA)/R`
`2muc=((B-0)20xx10^-4)/10=0.01T`
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  14. A current of 2A is increasing at a rate of 4A//s through a coil of ind...

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  15. The current decays from 5A to 2A in 0.01 s in a coil. The emf induced ...

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  16. A varying current in a coil change from 10A to 0A in 0.5 sec. If the a...

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  17. An air cored solenoid is of length 0.3 m, area of cross section 1.2 xx...

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  18. A solenoid of length 50 cm with 20 turns per cm and area of cross sect...

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  19. The current in a coil is changed from 5A to 10 A in 10^(-2) s. An emf ...

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