1.

A coil having n turns and resistance ROmegais connected with a galvanometer of resistance 4 ROmega . This combination is moved in time t seconds from a magnetic field W_1 Weber to W^2 Weber. The induced current in the circuit is ____

Answer»

`(W_2-W_1)/(5Rnt)`
`-(N(W_2-W_1))/(5Rt)`
`-(W_2-W_1)/(Rnt)`
`-(n(W_2-W_1))/(RT)`

Solution :INDUCED current `I=-(N DELTAPHI)/(R. Delta t) =-(N DeltaW)/(R. DELTAT)` `[because phi=W]`
`therefore I=-(n(W_2-W_1))/((R+4R).t) [ because phi=W]`
`therefore I=-(n(W_2-W_1))/((R+4R).t)[ because N=n]`
`therefore I=-(n(W_2-W_1))/(5Rt) [ because Delta t=t]`


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