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NEET 2020 Revision: Electric Potential and Capacitance- 01 (22.02.2020)

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Question 1

In the given figure, potential difference between A and B is

Question 2

A semiconductor having electron and hole mobilities

respectively.
If its intrinsic carrier density is

, then what will be the value of hole concentration P for which the conductivity will be minimum at a given temperature?

Question 3

Direction: Each of these questions contains two statements. Assertion and Reason Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

Assertion (A): Above Curie temperature, a ferromagnetic material becomes paramagnetic.
Reason (R): When a magnetic material is heated to very high temperature, it loses its magnetic properties.

Question 4

A parallel plate capacitor of capacitance c is connected to a battery and is charged to a potential difference v. Another capacitor of capacitance 2c is similarly charged to a potential difference 2v. The charging battery is now disconnected and the capacitors are connected in parallel to each other in such a way that the positive terminal of one is connected to the negative terminal of the other. The final energy of the configuration is

Question 5

A spherical drop of capacitance 1μF is broken into eight drops of equal radius. Then, the capacitance of each small drop is

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Feb 21NEET & AIIMS