Question

Two point electric charges $+10^{-8} C$ and $-10^{-8} C$ are placed $0.1 \,m$ apart. Find the magnitude of Total Electric field at the center of the line joining the two charges.

• A. $3.6 \times 10^{4} NC ^{-1}$
• B. $7.2 \times 10^{4} NC ^{-1}$
• C. zero
• D. $12.96 \times 10^{4} NC ^{-1}$

Answer 1

Answer: (B)

Both charges will give their respective field in same direction
$\therefore E =\frac{2 kq }{\left(\frac{ d }{2}\right)^{2}}$
$ q =10^{-8} C$
$ d =0.1\, m$