A metal sphere with radius ra = 1.20cm is supported on an insulating stand at the center of a hollow, metal, spherical shell with radius rb = 9.90cm . 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 500V , with the inner sphere at higher potential.

Part A
Calculate q.
q = C
Part B
Are the electric field lines and equipotential surfaces mutually perpendicular?
Yes
No
Part C
Are the equipotential surfaces closer together when the magnitude of E? is largest?
Equipotential surfaces closer together when the magnitude of E? is largest.
Equipotential surfaces closer together when the magnitude of E? is smallest.