Question

how to find direction of torque when current direction and magnetic field direction is given​

Answer 1

The torque direction comes from the cross product of magnetic moment and field. The field is up, so for the cross product to be to the left, the fingers have to curl from out of the page upward. Therefore the magnetic moment points out of the page.

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Answer 2

Answer:

magnetic field, and computing the cross-product. Doing so reveals that the force on the top segment is into the page, while the force on the bottom segment is out of the page.

The forces on the horizontal segments cancel, resulting in zero net force on the loop, but of course there is a net torque. Choosing an axis that is a horizontal line passing through the centers of the two vertical segments, we can compute the net torque on the loop. Choosing the positive torque direction to be to the left, the forces on top and bottom both generate torques in that positive direction, so:

τnet=Ftop(z2)+Fbottom(z2)=2(IyB)(z2)=I(yz)B(4.2.1)