A long wire carries a steady current. It is then bent into a circle of one turn and magnetic field at the centre of coil is B. Then it is bent into n-turns. Magnetic field at centre of coil will be |
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(a) |
2 B |
(b) |
(c) |
2 B |
(d) |
A long wire carries a steady current. It is then bent into a circle of one turn and magnetic field at the centre of coil is B. Then it is bent into n-turns. Magnetic field at centre of coil will be |
|||||||
(a) |
2 B |
(b) |
(c) |
2 B |
(d) |