The figure shows three infinitely long straight parallel current carrying conductors. Find the
(i) magnitude and direction of the net magnetic field at point A lying on conductor 1,
(ii) magnetic force on conductor 2.

Question

The figure shows three infinitely long straight parallel current
carrying conductors Find the
(i) magnitude and direction of the net magnetic field at point A
lying on conductor 1,
(ii) magnetic force on conductor 2

Shobhit Mittal · Accepted Answer

Dear Student,

i
 field at point Afield due to 2 will be inside the plane taken as -ve 
field due to 3 wire at A is outside the plane +ve
B=μ04I2π3r-μ03I2πr=-μ05I6πr  the net field in downward direction that is inside the plane 
ii
both wire 1 and 2 repel the wire 2 as the current in opposite direction in 2
Force per unit length=μ04I3I2π2r-μ0I3I2πr=3μ0I2πr  net force towards wire 1Regards

The figure shows three infinitely long straight parallel current carrying conductors. Find the (i) magnitude and direction of the net magnetic field at point A lying on conductor 1, (ii) magnetic force on conductor 2.

The figure shows three infinitely long straight parallel current carrying conductors. Find the
(i) magnitude and direction of the net magnetic field at point A lying on conductor 1,
(ii) magnetic force on conductor 2.