Electric Circuits
A parallel plate capacitor contain there dielectric layers of 1, 2 and 3 respectively and thickness of dielectric layers are 0.2 mm, 0.3 mm and 0.4 mm respectively. If area of plate is 20 cm2. What is the value of capacitance?

 None of them.
 36.6 pF.
 32 pF.
 30 pF.

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Electric Circuits
Atoms have no electric charge because they

 have neutrons in their nuclei.
 have an equal number of electrons and protons.
 have an equal number of neutrons and protons.
 have an equal number of charged and non charged particles.

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