An empty hollow metal sphere has a potential of +130 V with respect to ground (defined to be at V = 0) and has a charge of 1.8 10-9 C. Find the electric potential at the center of the sphere.

Electric Potential V=130 V

Explanation:

Electrical potential inside a hollow sphere is constant and is equal to electric potential of surface

So

Electric Potential V=130 V

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when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27