Question

A metal sphere with radius 1.10 cm is supported on an insulating stand at the center of a hollow,metal, spherical shell with radius T =9.60 cm.Charge +q is put on

the inner sphere and charge-q on the outer spherical shell. The magnitude of qis chosen to make the potential difference between the spheres 470 V, with the inner sphere at higher potential. Calculate q. Are the electric fieid lines and equipotential surfaces mutually perpendicular?

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