Question

A body of mass 10 gm and having charge 2C is attached to a spring which is suspended from ceiling. If it is vibrating then its time period is 1 sec. If an electric field of intensity 100 N/C is applied in the downward direction then the time period becomes:

• A. 1 sec
• B. 3 sec
• C. 4 sec
• D. $\frac{1}{2}$

Answer 1

The correct option is A 1 sec

$T=2\pi \sqrt{\frac{m}{k}}$
$T_1$ = T = 1 sec
Independent of force due to gravity and force due to electric field.