Three concentric spherical conductors A, B, and C of radii R, 2R , and 4R, respectively. A and C is shorted and B is uniformly charged (charge +Q). Charge on conductor A isPotential at A isPotential at B is

q1+q2=0vA=kq1R+kQ2R+kq24RvC=kq14R+kQ4R+kq24RvA=vCq1=−Q3 and q2=Q3vA=k−Q3R+Q2R+Q12R=Q16πε0RvB=k−Q6R+Q2R+Q12R=5Q48πε0Rq1+q2=0vA=kq1R+kQ2R+kq24RvC=kq14R+kQ4R+kq24RvA=vCq1=−Q3 and q2=Q3vA=k−Q3R+Q2R+Q12R=Q16πε0RvB=k−Q6R+Q2R+Q12R=5Q48πε0Rq1+q2=0vA=kq1R+kQ2R+kq24RvC=kq14R+kQ4R+kq24RvA=vCq1=−Q3 and q2=Q3vA=k−Q3R+Q2R+Q12R=Q16πε0RvB=k−Q6R+Q2R+Q12R=5Q48πε0R