A hemispherical shell is uniformly charge positively .the electric field at point on a diameter away from the centre is directed

Options

A. perpendicular to the diameter
B. parallel to the diameter
C. at an angle tilted towards the diameter
D. at an angle tilted away from the diameter

Answer

A

Explanation

If we imagine another hemisphere so that it becomes a complete sphere then the point described in question comes inside this completed sphere and electric field intensity at this point should be zero. From symmetry, we can understand that both halves must be producing equal and opposite fields at this point, which will be perpendicular to its diameter.