Question

A conducting shell of radius R carries charge – Q. A point charge +Q is placed at the centre. The electric field E varies with distance r (from the center of the shell) as-

• A.
• B.
• C.
• D.

Answer 1

Answer: (B)

Answer 2

According to Gauss theorem, the total electric flux through any closed surface Φ = $\left( \frac{1}{\varepsilon_{0}} \right) \times$ [net charge enclosed by surface]

Further, the net charge due to a dipole is zero

∴ Φ = $\frac{1}{\varepsilon_{0}}$ x 0 = 0