Two circular coils having identical turns and radius in the ratio 1 : 3 are joined in series. Find the ratio of magnetic field at the centres of coils. |
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(a) |
(b) |
(c) |
(d) |
4 : 1 |

Two circular coils having identical turns and radius in the ratio 1 : 3 are joined in series. Find the ratio of magnetic field at the centres of coils. |
|||||||

(a) |
(b) |
(c) |
(d) |
4 : 1 |

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