Two conducting square plates 6.5 cm on a side and separated by 2.3 mm air gap (dielectric constant of air gap is assumed to be 1) is fully charged with a 12.0 V battery. The battery is then disconnected and a dielectric material of dielectric constant 2.3 is inserted.

double the distance = divide strength by 4

see earlier

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