Two identical coils A and B of 1000 turns each lie in parallel plane such that 80% of the flux produced by one coil links with the other. If a current of 5 A flowing in A produces a flux of 0.05 mWb, then the flux linking with coil B is:
1
0.4 mWb
2
0.04 mWb
3
4 mWb
4
0.004 mWb
5
none of these
5
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