A battery is connected between two point...

A battery is connected between two points `A and B` on the circumference of a uniform conducting ring of radius `r` and resistance `R` . One of the arcs `AB` of the ring subtends an angle `theta` at the centre . The value of the magnetic induction at the centre due to the current in the ring is

proportional to `(180^@-theta)`

inversely proportional to r

zero , only if `(theta=180^@)`

zero for all values of `theta`

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