A) remains unchanged
B) becomes 1/3
C) is tripled
D) none of these.
Correct Answer: C
Solution :
Magnetic flux due to a circular coil having n turns is given by \[\text{o }\!\!|\!\!\text{ =}\,\text{B}\times A\] \[=\frac{{{\mu }_{0}}ni}{2r}\times A=\frac{{{\mu }_{0}}iA}{2r}\times n\] \[\Rightarrow \] \[\text{o }\!\!|\!\!\text{ = Kn}\] where \[K=\frac{{{\mu }_{0}}iA}{2r}\] Now if n is tripled, then magnetic flux linked with the coil \[\phi \] will be tripled.
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