Electrostatics (NEET Physics): Questions 28 - 30 of 107

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Question number: 28

» Electrostatics » Electrostatic Potential Energy

MCQ▾

Question

Two charges q 1 and q 2 are placed 30 cm apart, shown in the figure. A third charge q 3 is moved along the arc of a circle of radius 40 cm from C to D. The change in the electrostatic potential energy of the system is q34πϵ0P . What will be P?

Diagram 1 - Two charges q1 and q2

Diagram 1 - Two Charges q1 and q2

In figure two charges q1 and q2 are placed 30 cm apart. A third charge q3 is moved along the arc of a circle of radius 40 cm from C to D

Choices

Choice (4) Response

a.

8 q 2

b.

8 q 1

c.

6q 2

d.

6 q 1

Question number: 29

» Electrostatics » Electric Charges

MCQ▾

Question

the magnitude of electric field intensity E is such that, when an electron placed in it, electron would experience an electrical force is equal to its weight is given by mg. So, what is the magnitude of this electric field?

Choices

Choice (4) Response

a.

mge

b.

e2m2g

c.

mge

d.

emg

Question number: 30

» Electrostatics » Capacitors

MCQ▾

Question

A parallel plate capacitor is charged to a potential. difference of 50V. It is discharged through a resistance. After 1 second, the potential difference between plates becomes 40V. Then

Choices

Choice (4) Response

a.

Potential difference between the plates after 2 seconds will be 20 V

b.

Fraction of stored energy after 1 second is 16/25

c.

Potential difference between the plates after 2 seconds will be 30V

d.

Fraction of stored energy after 1 second is 4/5

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