Question

Two infinitely long line charge of same linear charge density l are arranged as shown in figure. The magnitude of electric field intensity at point P as shown in figure –

• A. $\frac{K\lambda}{R}$
• B. $\frac{2K\lambda}{R}$
• C. $\frac{2K\lambda}{R\cos\theta}$
• D. $\frac{2K\lambda}{R\sin\theta}$

Answer 1

Answer: (B)

$\frac{2K\lambda}{R}$

Answer 2

At point P

P = 2E_y

= 2$\frac { \mathrm { K } \lambda } { \mathrm { R } \cos \theta }$ [cosq – cos90⁰]

= $\frac { 2 \mathrm {~K} \lambda } { \mathrm { R } }$