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 arc AB of the ring subtends an angle `theta` at the centre. The value of the magnetic field produced at the centre due to the current in the ring is

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

zero for all values of `theta`

proportional to `2(180^(@)-theta)`

inversely proportional to r

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