\"26. The figure below shows a wire lying flat on the surface of a table. The wi

Question

"26. The figure below shows a wire lying flat on the surface of a table. The wire is connected to a battery so that the current flows left to right. A bar magnet is to be placed flat on the surface of the table in such a way that the wire experiences a force that lifts it up off of the table. Draw a picture showing the wire and the location and orientation of the magnet (including poles) and explain carefully why this would result in an upward force on the wire. View looking down on the tabletop. to positive terminal to negative terminal

Explanation / Answer

It is due to Lorentz force.

F = idl× B

B is from south to north in a bar magnet

So put the fingers in the direction of the current and curl them in the direction of magnetic field towards north. Then thumb will indicate the f

Direction of force.

I.e. upwards.

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