1.

Magnetic field due to a ring having n turns at a distance x on its axis is proportional to (if r = radius of ring) ______ .

Answer»

`r/((x^(2)+r^(2)))`
`r^(2)/((x^(2)+r^(2))^(3/2))`
`(nr^(2))/((x^(2)+r^(2))^(3/2))`
`(N^(2)r^(2))/((x^(2)+r^(2))^(3/2))`

SOLUTION :Here r = radius of ring
I = current
n = number of turns
The MAGNETIC field at x distance from the centre of ring
`B=mu_(0)/(4pi)(nIr^(2))/((x^(2)+r^(2))^(3/2))rArrBprop(nr^(2))/((x^(2)+r^(2))^(3/2))`


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