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The flux associated with coil changes fr...

The flux associated with coil changes from 1.35 Wb to 0.79 Wb within `(1)/(10)`s. then, the charge produced by the earth coil, if resistance of coil is `7Omega` is

A

0.08C

B

0.8C

C

0.008C

D

8C

Text Solution

Verified by Experts

The correct Answer is:
A
As, `I=(E )/(R ) =(d phi)/(Rdt)`
`rArr I dt =(dphi)/(R )`
Integrating,
`int Idt = int (dphi)/(R )`
`rArr q=(phi)/(R )`
If coil contains N turns, then `q = (N phi)/(R )`.
If there is flux change `Deltaphi` then `q=(N Deltaphi)/(R )`.
`rArr q=(1)/(7) xx (1.35 -0.79) =0.08C`
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