Question

A block of mass m is suspended vertically with a spring of spring constant k. The block is made to oscillate in a gravitation field. Its time period is found to be T. Now the space between the plates is made gravity free, and an electric field E is produced in the downward direction. Now the block is given a charge q. The new time period of oscillation is:

• A. T
• B. $T+2\pi \sqrt{\frac{qE}{md}}$
• C. $2\pi \sqrt{\frac{qE}{md}}$
• D. none of the above

Answer 1

Answer: (A)

T

Time period is independent of a constant force acting on the block of spring-block system. Its time period will remain same as,
$T=2\pi \sqrt{\frac{m}{k}}$