A charge of $0.8$ coulomb is divided into two charges $Q_{1}$ and $Q_{2}$. These are kept at a separation of $30 \mathrm{~cm}$. The force on $Q_{1}$ is maximum when

A charge of

$0.8$ coulomb is divided into two charges

$Q_{1}$ and

$Q_{2}$ . These are kept at a separation of

$30 \mathrm{~cm}$ . The force on

$Q_{1}$ is maximum when
(A)

$Q_{1}=Q_{2}=0.4 \mathrm{C}$
(B)

$Q_{1} \approx 0.8 \mathrm{C}, Q_{2}$ negligible
(C)

$Q_{1}$ negligible,

$Q_{2} \approx 0.8 \mathrm{C}$
(D)

$Q_{1}=0.2 \mathrm{C}, Q_{2}=0.6 \mathrm{C}$

2 Answers

A charge of $0.8$ coulomb is divided into two charges $Q_{1}$ and $Q_{2}$ . These are kept at a separation of $30 \mathrm{~cm}$ . The force on $Q_{1}$ is maximum when