Question

1. If radius of coil becomes two times and current
becomes half then magnetic field at centre of the
coil will be :-
(1) Two times
(2) Four times
(3) Half
(4) One fourth​

Answer 1

Explanation:

Answer: At the center of a current carrying coil, the magnetic field intensity is directly proportional to the current and inversely proportional to the radius of the coil. So, if the current is doubled and radius is halved, then the value of B increases by 4 times the initial value.

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Answer 2

Answer:

B will inceased by 4 times

Explanation: