Question

Uniform electric and magnetic fields are directed along X-direction. An electron is projected in X-direction with a velocity $v$, then

• A. magnitude of velocity of electron will increase
• B. magnitude of velocity of electron will decrease
• C. electron will turn towards right
• D. electron will turn towards left

Answer 1

The correct option is A magnitude of velocity of electron will increase

Since the charge particle is moving along the magnetic field direction hence the magnetic force acting $F=Bqv\sin \theta$ is zero because $\theta$ is zero but the electron will experience an electric force $F=qE$ opposite to field. Hence its velocity will be increased.