1.

ABCD is a square loop made of a uniform conductivity wire. The current enters the loop at A and leaves at D. The magneitic field is

Answer»

zero only at the centre of the loop
Maximum at the centre of the loop
Zero at all POINTS outside the loop.
Zero at all point inside the loop

Solution :`B_(1) prop (3I)/r`
`B_(2) prop 3xxI/r`.
Clearly, the two field are equal in magnitude the opposite in direction.


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