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Solution


Q.

A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected in the region such that its velocity is pointed along the direction of fields, then the electron             [2023]
1 will turn towards right of direction of motion  
2 will turn towards left of direction of motion  
3 speed will decrease  
4 speed will increase  

Ans.

(3)

Direction of electric lines of force is from positive charge to negative charge. Speed of electron will decrease due to electric force acting in anti-parallel direction.

Moreover, magnetic force of electron is zero.