(a)

Describe an activity to show that a current carrying conductor, placed in an external magnetic field experiences a force.

(b)

Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally towards the front wall from the back wall, is deflected by a strong magnetic field to your right side. Find the direction of the magnetic field.

(a) Procedure Take a small aluminium rod AB and using two connecting wires suspend it horizontally from a stand. Place a strong horse-shoe magnet in such a way that the rod lies between the two poles perpendicularly. Connect the aluminium rod in series with a battery and a key. Now pass a current through the aluminium rod from one end to another. (Procedure can also be explained with a Diagram) Observation It is observed that the rod is displaced on passing current though it.

(b) Magnetic field will be vertically downwards.