Electrostatics (NEET Physics): Questions 77 - 80 of 107

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Question number: 77

» Electrostatics » Electrostatic Potential Energy

MCQ▾

Question

Four charges + q, -q, + q and -q are put together on four corners of a square as shown in figure. The net electrostatic energy of the system is,

Square with Four charges + q, -q, + q and -q

Square With Four Charges + Q, -Q, + Q and -Q

Four charges + q, -q, + q and -q are put together on four corners of a square

Choices

Choice (4) Response
a.

Zero

b.

2kq2a

c.

2kq2a

d. All of the above

Question number: 78

» Electrostatics » Electric Field Due to a Point Charge

MCQ▾

Question

Electric field at point P is given as

E=σ2ϵ0k^2σ2ϵ0k^σ2ϵ0k^=2σϵ0k^

Choices

Choice (4) Response
a.

r -3

b.

r -1

c.

r -4

d.

r -2

Question number: 79

» Electrostatics » Capacitors

Assertion-Reason▾

Assertion (Ꭺ)

If the distance between parallel plates of a capacitor is halved and dielectric constant is made three times, then the capacitance becomes 6 times.

Reason (Ꭱ)

Capacity of the capacitor does not depend upon the nature of the material of plates.

Choices

Choice (4) Response
a. Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ
b. Both Ꭺ and Ꭱ are false
c. Ꭺ is false but Ꭱ is true
d. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

Question number: 80

» Electrostatics » Electric Potential

MCQ▾

Question

Identical point charges, each having +q charge, are fixed at each of the points x = x 0, x = 3x 0, x = 5x 0 ……… infinite, on the x-axis and an identical point charges, each having -q charge, are fixed at each of the points x = 2x 0, x = 4x 0, x = 6x 0 ……. infinite. Here x 0 is a positive constant. Potential at the origin due to the above system of charges is,

Choices

Choice (4) Response
a.

b.

qln24πϵ0x0

c.

q8πϵ0x0ln2

d.

0

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