The wire loop PQRSP formed by joining two semicircular wires of radii R1 and R2 carries a current I as shown. The magnitude of the magnetic induction at the centre C is ____________.

Answer

A, B, D

Explanation

`B_("due to st. part RS") =B_("due to st. part PQ")=0` at `c`
`B_("due to curvedpart QR") =(mu_(0)I)/(4R_(1))` out of paper
`B_("due to curvedpart SP") =(mu_(0)I)/(4R_(2))` into the paper
`B_("Net")=(mu_(0)I)/4[1/R_(1)-1/R_(2)]`