St. Britto Hr. Sec. School - Madurai
12th Physics weekly Test -1 ( Electrostatics )-Aug 2020
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The charge of an electron is _________.
1.6 x 10-19 C
1.6 x 10-91 C
16 x 10-20 C
6.1 x 10-19 C
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A parallel plate capacitor stores a charge Q at a voltage V. Suppose the area of the parallel plate capacitor and the distance between the plates are each doubled then which is the quantity that will change?
Capacitance
Charge
Voltage
Energy density
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Increasing the charge on the plates of a capacitor means
increasing the capacitance
increasing the potential difference between the plates
both (a) and (b) above
none of the above
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The magnitude of electric dipole moment of water molecule is
6 x 10-30 cm
6.2 x 10-30 cm
6.1 x 10-30
5.95 10-30 cm
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What is Polarisation?
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A positive charge +q is located at a point, what is the work done, if a unit positive charge is carried once around this charge along a circle of radius r about this point?
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What are induced dipoles.
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The electric field lines never intersect Justify.
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What is mean by ‘Electric field lines’?
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What is dielectric breakdown.
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What is principle used in Microwave oven? Explain.
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Deduce electric flus for closed surfaces.
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Obtain an expression for potential energy due to a collection of three point charges which are separated by finite distances.
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Derive the expressions for the potential energy of a system of point charges.
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Explain in detail Coulomb’s law and its various aspects.
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Explain in detail how charges are distributed in a conductor, and the principle behind the lightning conductor.
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The total number of electrons in the human body is typically in the order of 1028. Suppose, due to some reason, you and your friend lost 1% of this number of electrons. Calculate the electrostatic force between you and your friend separated at a distance of 1m. Compare this with your weight. Assume mass of each person is 60 kg and use point charge approximation.
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It requires 50 μJ of work to carry a 2C charge from point R to S. What is the potential difference between these points?
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How many electrons are there in one coulomb of negative charge?
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The radius of gold nucleus (Z = 79) is about 7 x 10-15m. Assume that the positive charge is distributed uniformly throughout the nuclear volume. Find the volume charge density.