JEE Main 2022 Physics question
The electric current in a circular coil of 2 turns produces a magnetic induction at its centre. The coil is unwound and is rewound into a circular coil of 5 turns and the same current produces a magnetic induction at its centre. The ratio of is-
Answer: (2)
Solution
. The same length of wire is used, so R_{1})$ = 5(2π
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