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Electrostatic and Capacitance

Electrostatic and Capacitance
Dielectric strength of mica is

50 to 200 kV/mm
10 to 20 kV/mm
30 to 50 kV/mm
300 to 500 kV/mm

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Electrostatic and Capacitance
Dielectric strength ______ with increasing thickness

increases
None of these
remains unaltered
decreases

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Electrostatic and Capacitance
The absolute permittivity of free space is given by

8.854 x 1(T9 F/m)
8.854 x KT11 F/m
8.854 x 1(T10 F/m)
8.854 x 10?12 F/m

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Electrostatic and Capacitance
Electric displacement is a______quantity.

Scalar quantity
Vector quantity
None of the listed here
Both scalar & vector

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Electrostatic and Capacitance
Acharge which when placed in vacuum from an equal and similar charge repels with a force of 9 x 10 N, is known as

pico-coulomb
coulomb
milli-coulomb
micro-coulomb

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Electrostatic and Capacitance
A positive and a negative charge are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be

25 times larger than before
5 times smaller than before
10 times greater than before
5 times greater than before

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