Special theory of relativity — CSIR Net PYQ (Question 4)

A Special theory of relativity previous-year question (PYQ) from Classical Mechanics (CSIR Net). Read the question, check the correct answer, then practise the full topic.

Question 4 of 27 · 5.0 marks

A rod of length

L

carries a total charge

Q

distributed uniformly. If this is observed in a frame moving with a speed

v

along the rod, the charge per unit length (as measured by the moving observer) is

1 $\frac{Q}{L} (1 - \frac{v ^{2}}{c ^{2}})$
2 $\frac{Q}{L} 1 - \frac{v ^{2}}{c ^{2}}$
3 $\frac{Q}{L 1 - \frac{v ^{2}}{c ^{2}}}$
4 $\frac{Q}{L ( 1 - \frac{v ^{2}}{c ^{2}} )}$

Correct answer: Option 3

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This Special theory of relativity PYQ is part of the Classical Mechanics section of CSIR Net. Browse more Special theory of relativity questions or join the PhysicsByAaryan live batch for full conceptual coverage.