Question

r=0.25x10
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) twice the earlier value
b) half the earlier value
c) quarter of its earlier value
d) unchanged​

Answer 1

Answer:

a

Explanation:

if we change the wire the value double

Answer 2

magnetic field does not depends on the diameter of wire.

opt. d)