Define the principle of a moving coil galvanometer, Physics

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(a) With the help of a labelled diagram, define the principle and working of a moving coil galvanometer.

(b) Two parallel coaxial circular coils of equal radius 'R' and equal number of turns 'N', carry equal currents 'I' in the similar direction and are separated by a distance '2R'. Find the magnitude and direction of the net magnetic field formed at the mid-point of the line joining their centres

 


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