A satellite in a circular orbit of radius R has period T. For radius 4R, period is MCQ with Answer and Explanation

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A satellite in a circular orbit of radius R has period T. For radius 4R, period is

A. 2T

B. T/2

C. 4T

D. 8T

Answer: Option D

Solution (By JKSSB Mock Tests)

Kepler's 3rd law: T² ∝ R³ => T' = T (4)^(3/2) = T×8 = 8T.

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Question #1

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A bar magnet is cut into two equal parts transversely. The pole strength of each piece becomes

A. Same

B. Zero

C. Double

D. Half

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Correct Answer: Option A

Explanation:
Pole strength is a property of the magnet; when cut transversely, each piece still has both north and south poles with same pole strength as original. Magnetic moment becomes half because length halves. Each is a complete magnet.

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Question #2

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Electron e/m measured by:

A. Millikan

B. Thomson

C. Rutherford

D. Bohr

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Correct Answer: Option B

Explanation:
J.J. Thomson measured e/m using cathode ray deflection (1897). Millikan later measured e (oil drop). Memory aid: 'Thomson = e/m; Millikan = e'. Experimental physics history frequently tested in competitive exams.

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