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A circular coil carrying a current has radius and number of turns . If all the three, i.e. the…
A circular coil carrying a current $I$ has radius $R$ and number of turns $N$. If all the three, i.e. the current $I$, radius $R$ and number of turns $N$ are doubled, then, magnetic field at its centre becomes:
- (a)Double
- (b)Half
- (c)Four times
- (d)One fourth
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From ISC 2018 Physics Paper 1, question 1(A)(ii).