Two point charges `+10^(-7) C` and `-10^(-7)C` are placed at A and B 20 cm apart as shown in the figure. Calculate the electric field at C, 20 cm apart from both A and B.

Options

A. `1.5 xx10^(-5) N//C`
B. `2.2 xx10^(4) N//C`
C. `3.5 xx10^(6) N//C`
D. `3.0 xx10^(5) N//C`

Answer

B

Explanation

`[vecE_A]=|vecE_B|=E`
`=(Kq)/r^2`
`E_("net") = 2E cos 60^@`
`=2 xx (9xx10^9 xx10^(-7) xx1//2)/((0.2)^2)=2.25 xx10^4 N//C`