Question

A straight wire AB is stretched between the pole pieces of a strong magnet as shown. The wireis connected to a battery through a key. What will happen when plug is inserted in the key?Name the rule that you use for the purpose. State the rule. What will happen, when the (i)terminals of the battery are reversed (ii) pole pieces of the magnet are reversed?

Answer 1

When a straight wire AB is stretched between the pole pieces of a strong magnet as shown. The wire is connected to a battery through a key. Then

--->A force is exerted on the straight wire  when it is placed in the magnetic field. The wire will be displaced from its original position.

---> When the direction of the current through conductor is reversed .Then the direction of force acting on the current carrying wire also is reversed.

-->By changing the poles of the magnet, we can observe that the force acting on the conductor will be reversed.

---->Flemimgs Left hand rule can be used to now the direction of force on wire.It states that  Stretch the thumb, forefinger and middle finger of your left hand in such a way that they are mutually perpendicular to each other. If the first finger point direction of magnetic fields and second finger in the direction of the current then thumb indicates the direction of force acting on the conductor.