NEET Physics: Questions 267 - 270 of 2098

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Question number: 267

» 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: 268

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A lady is walking on a level road at a speed of 8 km/h. Raindrops fall vertically with a speed of 6 km/h. Find the velocity of raindrops with respect to the men.

Choices

Choice (4) Response

a.

4 km/hr

b.

3 km/hr

c.

10 km/hr

d.

7 km/hr

Question number: 269

» 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

Question number: 270

» Electrostatics » Coulomb's Law

MCQ▾

Question

An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. Calculate the Coulomb force F between proton and electron. (here k=14πϵ0)

Choices

Choice (4) Response

a.

Ke2r3r^

b.

Ke2r3r^

c.

Ke2r3r

d.

All of the above

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