A current flows in a wire running between the S and N poles of a magnet lying horizontally as shown in Figure below: The force on the wire due to the magnet is directed: (a) from N to S (b) from S to N (c) vertically downwards (d) vertically upwards "

(c) vertically downwards

Explanation

Using Fleming's left-hand rule here, we find that the force on the wire should act vertically downwards.

According to this rule, when left hand's thumb, index finger and middle finger are held mutually perpendicular to one another, the index finger represents the direction of the magnetic field, the middle finger represents the direction of the current and the thumb represents the direction of the force experienced by the wire.

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