The potential at a point due to a point charge is 10 V at distance 2 m. Potential at 4 m is MCQ with Answer and Explanation

The potential at a point due to a point charge is 10 V at distance 2 m. Potential at 4 m is
A. 10 V
B. 20 V
C. 5 V
D. 2.5 V
Answer: Option C
Solution (By JKSSB Mock Tests)
V ∝ 1/r. So if r doubled, V halved = 5 V.

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Practice More Physics Questions

Question #1
When a small spherical metal body falls through a highly viscous liquid, it attains a terminal velocity. This terminal velocity is directly proportional to:
A. The square of the radius of the sphere
B. The radius of the sphere
C. The square root of the radius of the sphere
D. The inverse of the radius of the sphere

Correct Answer: Option A


Explanation:
According to Stokes' Law, the terminal velocity (Vt) of a spherical body falling through a viscous medium is given by Vt = 2r^2(rho - sigma)g / 9(eta). Here, r is the radius. The formula clearly shows that the terminal velocity is directly proportional to the square of the radius (r^2).

This question belongs to: Science Physics
Question #2
The colour of light with minimum wavelength in visible spectrum is
A. Green
B. Violet
C. Yellow
D. Red

Correct Answer: Option B


Explanation:
Violet ~400 nm, shortest wavelength.

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Question #3
Which of the following is NOT a unit of pressure?
A. Torr
B. Watt
C. Pascal
D. Bar

Correct Answer: Option B


Explanation:
Watt is power. Others are pressure units.

This question belongs to: Science Physics