A. 4πεoq²r
B. qr/4πεo
C. q/4πεor
D. q²/4πεor
E. q²/4πεor

Correct Answer:

Option C – q/4πεor

SEE ALSO  Metal rods of length 20m each are laid end to end to form a bridge at 25°C. What gap will be provided between consecutive rails for the bridge to withstand 75°C? [Linear expansivity of the material = 2.0 x 10^-5K‾¹]

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