Electrostatics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 76 - 79 of 109

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Question number: 76

» Electrostatics » Coulomb's Law

MCQ▾

Question

Electric charges of 1μC, -1μC and 2μC are placed in air at the corners A, B and C respectively of an equilateral triangle ABC having length of each side 10 cm. The resultant force on the charge at C is

Choices

Choice (4) Response

a.

3.6 N

b.

2.7 N

c.

1.8 N

d.

0.9 N

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.

c.

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

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

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