1.

A coil having n turns and resistance R Omega is connected with a galvanometer of resistance 4 R Omega. This combination is moved in time t sec 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 :e.m.f. `=-n.(d PHI)/(dt)`
`rArr IR=-n.(d phi)/(dt) rArr I=-(n)/(R ).(d phi)/(dt)`
`rArr I=-(n)/(R_(1))((W_(2)-W_(1)))/((t_(2)-t_(1)))`.USE this FORMULA for I
`I=(-1)/((R+4R)).(n(W_(2)-W_(1)))/(t)rArr I=-(n(W_(2)-W_(1)))/(5Rt)`.


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