Question

A laboratory has very strong magnetic field upwards, i.e. towards the ceiling. An electron gun is fired towards a wall. The electron will:

• A. Hit the other wall along the same line.
• B. Hit the ceiling.
• C. Hit the ground.
• D. Hit the wall on the left side of the shooter.

Answer 1

The correct option is D Hit the wall on the left side of the shooter.

The answer can be found out using Fleming's left-hand rule:

According to the order: Thumb - Force, Forefinger is Magnetic Field, Middle finger- Current. The direction of current is always opposite to the direction of flow of electrons.

The electrons will move towards the wall which is on the left side of the shooter.