Question

A spring-block system undergoes simple harmonic motion on a smooth horizontal surface. The block is now given some positive charge, and a uniform horizontal electric field to the right is switched on. As a result,

• A. the time period of oscillation will increase
• B. the time period of oscillation will decrease
• C. the time period of oscillation will remain unaffected
• D. the mean position of simple harmonic motion will shift to the left

Answer 1

The correct option is C the time period of oscillation will remain unaffected

When a constant force is superimposed on a system which undergoes SHM along the line of SHM, the time period does not change as it depends on mass of the block and force constant of spring.
The mean position changes as this is the point where net force on the particle is zero.