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WBJEE 2018 Physics Solved Paper

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Question : 14

Total: 39

A circular loop of radius 'r' of conducting wire connected with a voltage source of zero internalresistance produces a magnetic filed 'B' at its centre. If instead, a circular loop of radius '2r' made ofsame material, having the same cross section is connected to the same voltage source, what will be themagnetic field at its centre ?

B
2
B
4
2B
B

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