A spherical capacitor with radii a 8 cm b 12 cm is filled by dielectric with constant K 4 8 If the capacitor carries the charge

Question

A spherical capacitor with radii a 8 cm b 12 cm is filled by dielectric with constant K 4 8 If the capacitor carries the charge 4 pC and the point P is at the midway between two plates r 10 cm the electric field at point P has the magnitude in V m

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