MHT CET 2024 Physics question
A sphere 'A' of radius 'R' has a charge 'Q' on it. The field at point B outside the sphere is 'E'. Now another sphere of radius '2R' having a charge '-2Q' is placed at B. The total field at the point midway between A and B due to both the spheres is
Answer: (C)
Solution
Let the distance between the centres A and B be . Given . The midpoint is at from each centre, outside both spheres (a charged sphere acts as a point charge at its centre outside it). Field due to A (positive): , directed away from A, i.e. towards B.
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