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

(a) Twice the earlier value

(b) Same as the earlier value

(c) One-half of the earlier value

(d) One-quarter of the earlier value

Amit Saxena , 11 Years ago

Grade upto college level