Question

A spring block system undergoes vertical oscillations above a large horizontal metal sheet with uniform positive charge. The time period of the oscillation is T. If the block is given a charge Q, its time period of oscillation will be-

• A. T
• B. > T
• C. < T
• D. > T if Q is +ve and < T if Q is –ve

Answer 1

Answer: (D)

> T if Q is +ve and < T if Q is –ve

Answer 2

max string through the cube=$\sqrt { 3 }$a

f. = =