If an object made of substance A is rubbed with an object made of substance B, then A becomes positively charged and B becomes negatively charged. If however, an object made of substance C, then A becomes negatively charged, What will happen if an object made of substance B is rubbed against an object made of substance C?
(a) B becomes positively charged and C becomes positively
(b) B becomes positively charged and C becomes negatively charged.
(c ) B becomes negatively charged and C becomes positively charged.
(d) B becomes negatively charged and C becomes negatively charged.

Options

A. Both Y and Z becomes positively charged.
B. Y becomes positively charged and Z becomes negatively charged.
C. Y becomes negatively charged and Z becomes positively charged.
D. Both Y and Z becomes negatively charged.

Answer

C

Explanation

When X and Y are rubbed, X becomes positively charged and Y becomes negatively charged. It means electrons are loosely bound with X in comparison to Y. When X and Z are rubbed together, X becomes negatively charged and Z positively charged. It means electrons are loosely bound with Z in comparison to X. Hence, electrons are most loosely bound in Z. So if Y and Z are rubbed together, Z will lose electrons and Y will receive electrons. Hence, Z will become positively charged and Y will become negatively charged.