Question

If the charge on an object is doubled then electric field becomes

• A. half
• B. double
• C. unchanged
• D. thrice

Answer 1

Answer: (B)

As $E=\frac{1}{4\pi {\epsilon }_0}\frac{q}{r^2}$
If $q^{\prime }=2q$, then $E^{\prime }=\frac{1}{4\pi {\epsilon }_0}\frac{2q}{r^2}$ or $E^{\prime }=2E$
So electric field is doubled.