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Draw a labelled diagram of a moving coil galvanometer. Describe briefly its principle and working. |
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Answer» SOLUTION :PRINCIPLE and working : A current carrying coil, placed in a UNIFORM magnetic field, (can) experience a torque Consider a rectangular coil for which no. of turns `=` N, Area of cross-section `= l xx b = A`, Intensity of the uniform magnetic field `=B`, Current through the coil `= I` `:.` Deflecting torque `= B I l xx b = B I A` For N turns `tau =` NBIA Restoring torque in the spring `= k theta` ( `k=` restoring torque per unit twist) `:. N B I A = k theta` `:. I = ((k)/(NBA))theta` `:. I prop theta` The deflection of the coil, is therefore, PROPORTIONAL to the current flowing through it. 
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