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CBSE 12th Standard Physics Subject Electrostatic Potential And Capacitance HOT Questions 2 Mark Questions 2021

Published on: 27/05/2021

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Questions:

Generic 2

5 x 2 = 10

A and B have identical size and same mass. A becomes A²⁺ and B become B^2- . Will A²⁺ and B^2- still have the same mass? Why?

A technician has only two capacitors. By using them in series or in parallel, he is able to obtain the capacitance of 4 \(\mu \) F, 5 \(\mu \) F, 20 \(\mu \) F. and 25 \(\mu \) F. What is the capacitance of both capacitors?

Guess a possible reason, why water has a much greater dielectric constant (= 80) than mica (= 6)?

A 2m insulating slab with a large aluminum sheet of area 1m² on its top is fixed by a man outside his house one evening. Will he get an electric shock, if he touches the metal sheet next morning?

A charged Particle is free to move in an electric field. Will it always move along an electric line of force ?

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Answers Key:

Generic 2

5 x 2 = 10

No, they will not have the same mass. B^2- has more mass as, it has gained two electrons, whereas A²⁺ has lost two electrons.

Let the two capacitors be C₁ and C_2,capacitance will be maximum when connected in parallel.
i.e. C₁+ C₂ = 25
Capacitance will be minimum when connected in series.
i.e. \(\frac { { C }_{ 1 }{ C }_{ 2 } }{ { C }_{ 1 }+{ C }_{ 2 } } =4\)
Since, we are left with only two values 5 \(\mu \) F and 20\(\mu \) F.
So, the value of capacitances will be 5 \(\mu \) F and 20\(\mu \) F.

Dielectric constant of water is much greater than that of mica because of the following reason
(i) water has a symmetrical shape as compared to mica
(ii) water has permanent dipole moment.

Yes, the man will get an electric shock, if he touches the metal slab next morning because the steady discharging current in the atmosphere charges up the aluminum sheet. As a result, its voltage rises gradually. This rise in voltage depends on the capacitance of the capacitor formed by aluminum slab and ground.

If Changed particle was Initially at rest, it will move along the direction of electric field. If initial velocity of the charged particle makes a certain angle with electric field, then the charged particle will no move along the line of force.