The magnetic flux density at a point distant d from a long straight current carrying conductor is B, then its value at distance `d/2` will be-

Options

A. 4B
B. 2B
C. `B/2`
D. `B/4`

Answer

B

Explanation

`B_(P)=(mu_(0)i)/(2pid)`
`B=(mu_(0)i)/(2pi(d//2)') (dt x=d/2)`
`rArr B_((d//2)) =2B`