JEE Main 2013 Physics question
A circular loop of radius 0.3 cm lies parallel to a much bigger circular loop of radius 20 cm. The centre of the small loop is on the axis of the bigger loop. The distance between their centres is15 cm. If a current of 2.0 A flows through the smaller loop, then the flux linked with a bigger loop is:
Answer: (3)
Solution
By reciprocity, use the mutual inductance from the big loop's field at the small loop: per ampere $=
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