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A mild steel closed magnetic circuit has a mean length of 75mm and a cross-sectional area of 320.2mm2.
A current of 0.40 a flows in a coil wound uniformly around the circuit and the flux produced is 200µWb.
If the relative permeability of the steel at this value of current is 400 find
(a) The reluctance of the material and
(b) The number of turns of the coil.
In the device shown in Figure, when the current in the primary coil of 1000 turns increases linearly from 1A to 6A in 200ms, an e.m.f. of 15V is induced into the secondary coil of
Determine the value of ‘a' for which the vector field is solenoidal.
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