# 507 - Physics Questions Answers

Sir, in the formula for current , in the ncert it first talks about steady state current. Then it writes i=q/t. but then it generalises and writes the formual i=(delta)q/(delta)t

sir my doubt is that how do we define flow of charge in steady state across a cross section. and why is there (delta)q in formula since the charge is not changing with time.

is it the amount of charge passing per unit time or the change in charge per unit time?

pls help

Joshi sir comment

It is the amount of charge passing through a particular cross section of wire in unit time

Find the moment of inertia of an ellipsoid about its mazor axis.

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All options are dimensionally incorrect. Please rectify.

A small ring is threaded on an inextensible frictionless cord of length 2l.  The ends of the cord are fixed to a horizontal ceiling.  In equilibrium, the ring is at a depth h below the ceiling.  Now the ring is pulled aside by a small distance in the vertical plane containing the cord and released.  If period of small oscillations of the ring is kπ, find k.  Given,

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Two balls A and B are simultaneously released on two frictionless inclined planes from the position shown. The inclined planes have equal inclinations. The balls pass through a particular horizontal level 12s and 4s after they were released. How long after they were released will they be closest to each other?

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Question in based on a figure, yet it is not provided.

Please update it for getting the solution.

Thanks