Answer :

nl = 100


ns = 50


rl = 10 cm


rs = 5 cm



Both the coils have a common center and hence the effect due to the current flowing will depend on the direction of flow. We can calculate the individual results and then do the vector addition of both the forces to get the resultant magnetic fields


1) In the same sense


Field due to larger coil



Field due to smaller coil



As the direction is same and both the fields are acting in the same direction, that outside the plane of the paper, we can simply perform a scalar addition






Similarly for


2) Opposite sense


As the direction is opposite, we can simply perform scalar subtraction to get the resultant






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