A) twice the earlier value
B) one-half of the earlier value
C) one quarter of the earlier value
D) same as earlier value
Correct Answer: D
Solution :
[d] For external points the current carrying wire behaves as if the whole current were concentrated at the axis, so magnetic field at far points from axis \[B=\frac{{{\mu }_{0}}i}{2\pi r}\] remains unaffected if diameter of wire is changed.
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