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Physics-

General

Easy

Question

Two plane mirrors of length L are separated by distance L and a man $M subscript 2 end subscript$ is standing at distance L from the connecting line of mirrors as shown in figure. A man $M subscript 1 end subscript$ is walking along a straight line at distance 2L parallel to the mirrors at speed u. Then the man $M subscript 2 end subscript$ at O will be able to see image of $M subscript 1 end subscript$ for total time of

$\frac{4 L}{u}$
$\frac{3 L}{u}$
$\frac{6 L}{u}$
$\frac{9 L}{u}$

The correct answer is: $fraction numerator 6 L over denominator u end fraction$

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Question: Two capacitors of capacity $6 mu F$ and $3 mu F$ are charged to 100V and 50 Separately and connected as shown. Now all the three switches $S subscript 1 end subscript S subscript 2 end subscript$ and $S subscript 3 end subscript$ are closed.

Suppose $q subscript 1 end subscript comma q subscript 2 end subscript$ and $q subscript 3 end subscript$ be the magnitudes of charges flown from switches $S subscript 1 end subscript comma text end text S subscript 2 end subscript$ and $S subscript 3 end subscript$ after they are closed. Then :

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i) In an isolated system (neither connected to the terminal of a battery nor to any other source of charge e.g. each) net charge remains constant.
ii) From two terminal of a battery or from two plates of a capacitor equal and opposite charges enter or leave.
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ii) From two terminal of a battery or from two plates of a capacitor equal and opposite charges enter or leave.
Question: Two capacitors of capacity $6 mu F$ and $3 mu F$ are charged to 100V and 50 Separately and connected as shown. Now all the three switches $S subscript 1 end subscript S subscript 2 end subscript$ and $S subscript 3 end subscript$ are closed.

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Which plate (s) form an isolated system :

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ii) From two terminal of a battery or from two plates of a capacitor equal and opposite charges enter or leave.
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Two capacitors of equal capacitance $open parentheses C subscript 1 end subscript equals C subscript 2 end subscript close parentheses$ are shown in the figure. Initially, while the switch $S$ is open, one of the capacitors is uncharged and the other carries charge $Q subscript 0 end subscript$ . The energy stored in the charged capacitor is $U subscript 0 end subscript$ . Sometimes after the switch is closed, the capacitors $C subscript 1 end subscript$ and $C subscript 2 end subscript$ carry charges $Q subscript 1 end subscript$ and $Q subscript 2 end subscript$ , respectively; the voltages across the capacitors are $V subscript 1 end subscript$ and $V subscript 2 end subscript semicolon$ and the energies stored in the capacitors are $U subscript 1 end subscript$ and $U subscript 2 end subscript$ . Which of the following statements is INCORRECT ? The figure shows a diagonal symmetric arrangement of capacitors and a battery

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