Electrostatics-Electric Potential (NEET Physics): Questions 20 - 23 of 25

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Question number: 20

» 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

Question number: 21

» Electrostatics » Electric Potential

MCQ▾

Question

How much kinetic energy will be gained by an α- particle in going from a point at 70V to another point at 50V?

Choices

Choice (4) Response
a.

40 MeV

b.

40 keV

c.

40 eV

d.

0 eV

Question number: 22

» Electrostatics » Electric Potential

Assertion-Reason▾

Assertion (Ꭺ)

A bird perches on a high power line and nothing happens to the bird.

Reason (Ꭱ)

The level of bird is very high from the ground.

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 true but Ꭱ is false
d. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

Question number: 23

» Electrostatics » Electric Potential

MCQ▾

Question

A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of Q from the dipole is r (much larger than the size of the dipole), then electric field at Q is proportional to

Choices

Choice (4) Response
a.

p -1 and r -2

b.

p and r -2

c.

p and r -3

d.

P 2 and r -3

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