Question

19. Current is flowing in a circular coil. If the radius of the
coil is doubled, then the value of magnetic field intensity
at its centre will be :
(B) half
(C) double
(D) four times
39
(A) same​

Answer 1

double is your answer...........

Answer 2

Answer:

If the radius of the coil is doubled, then new radius, r' = 2r. New magnetic field intensity is given by : So, the radius of the coil is doubled, then the magnetic field intensity at its centre will be half of the initial magnetic field.