A straight wire of diameter 0.5 mm carrying a current of 1A is replaced by another wire of 1mm diameter carrying the same current. The strength of magnetic field far away is

A straight wire of diameter 0.5 mm carrying a current of 1A is replaced by another wire of 1mm diameter carrying the same current. The strength of magnetic field far away is

  1. A

    twice the earlier value

  2. B

    half the earlier value

  3. C

    quarter of its earlier value

  4. D

    unchanged

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    Solution:

    we know B=μ0i2πr, B is independent of diameter. So the strength of magnetic field remain unchanged

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