Two concentric and coplanar circular coils have
radii a and b (>> a) as shown in figure. Resistance
of the inner coil is R. Current in the outer coil is
increased from 0 to i, then find the total charge
circulating the inner coil.
sir, please explain how u calculated flux
Asked by jaychandran1967
29th September 2018,
7:10 PM
Answered by Expert
Answer:
induced emf e in the coil is given by, e = -(dφ/dt) , where φ is flux of magnetic field.
induced current i = e/R = 
, where R is resistance of coil
, where R is resistance of coilcharge circulating in th coil Q = | i×dt | = dφ/R = (1/R) d( B×A) .................(1)
where B is flux density of magnetic field, A is area of coil.
magnetic field flux density B inside the coil of radius a is given by, B 
In eqn.(1), Area A is constant and by substituting for B, we get 
............................(2)
............................(2)in Eqn.(2), di is change in current 0 to i, hence we can write di = i to get charge Q
Hence 
Answered by Expert
4th October 2018,
2:04 AM
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