7. magnitude of the force on a charge q kept at one corner of a cube of side 'a, due to other ch kept at each corners of the cube 1 3+ 4tte al 1 4tt&0 l (b) (a)

7. Magnitude of the force on a charge q kept at one corner of a cube of side 'a, due to other Ch kept at each corners of the cube 1 3+ 4TtE aL 1 4Tt&0 L (B) (A) 1 2 4TtE, a 3+3+ v2 4 TE (D) (C)