Discussion
A point charge −q , is placed at a distance x from an isolated conducting plane. The electric field at any point P on the other side of the plane is directed
Answer: B
The field on the other side is directed towards the plane perpendicularly.
The charge −q induces positive charge on the near face of the conductor and leaves an equal negative charge on the far face. The electric field just outside a conductor is always perpendicular to its surface, and next to a negatively charged surface it points towards that surface. So at points on the far side the field is normal to the plane and directed into it.
Radial directions centred on the point charge would ignore the screening by the conductor, a field parallel to the surface is impossible at a conductor in equilibrium, and 'away from the plane' would need positive charge on the far face.
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