Question

Following is square shape loop, whose one arm
BC produces magnetic field B at the centre of
coil. The resultant magnetic field due to all the
arms will be
(1) 4B
(2) B/2
(3) B
(4)2B​

Answer 1

Answer:

Option (1) 4B

Explanation:

IF the current in the square loop is moving in anticlockwise direction, the magnetic field due to any of the arm of the loop will be outside the plane of the paper. Therefore, the magnetic field produced by all the arms will add up.

If the magnetic field at the centre of square loop due to one arm is B

Then the magetic field at the centre due to all four arms will be

$=B+B+B+B$

$=4B$

Hope this answer is helpful.