Questions
A circular coil has one turn and carries a current i. The same wire is wound into a smaller coil of 4 turns and the same current is passed through it. The field at the centre
a
decreases to 1/4 of the value
b
remains the same
c
increases to 14 times the value
d
increases to 16 times the value
detailed solution
Correct option is D
B∝(n/r)Here number of turns becomes 4 times while the radius becomes (1/4) times. Hence B becomes 16 timesTalk to our academic expert!
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