Find the Net Magnetic field at point P due to the current `I_1,I_2,I_3`.

Options

A. zero
B. `1`
C. `2`
D. `3`

Answer

A

Explanation

At `P: B_(1)=(mu_(0)i)/(2pi.sqrt(2)d)`, along `CP`
`B_(2)=(mu_(0)i)/(2pid), bot ^(ar)` to `BP` at `P`
`B_(2)=(mu_(0)i)/(2pi.sqrt(2)d)`, along `PA`
The resulatant of `B_(1)` and `B_(2)` is equal and opposite to `B_(2)` hence `B_(p)=0`