Question

A glass rod when rubbed with silk cloth, acquires a charge of $1.6\times {10}^{-11}C$, then the charge on silk cloth will be:

• A. $-3.2\times {10}^{-11}C$
• B. $-2.4\times {10}^{-13}C$
• C. $-1.6\times {10}^{-13}C$
• D. $-1.6\times {10}^{-11}C$

Answer 1

The correct option is D $-1.6\times {10}^{-11}C$

When glass rod is rubbed with silk, electrons move from rod to silk.

Since silk gets electrons it becomes negatively charged and the number of electrons gained by silk is same as that lost by rod.

Hence magnitude of charge on silk is same as that on rod.

Hence charge on silk$=-1.6\times {10}^{-11}C$

Answer-(D)