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Physics-

General

Easy

Question

A resistor R, an inductor L, a capacitor C and voltmeters $V subscript 1 end subscript$ , $V subscript 2 end subscript$ and $V subscript 3 end subscript$ are connected to an oscillator in the circuit as shown in the adjoining diagram. When the frequency of the oscillator is increased, up to resonance frequency, the voltmeter reading (at resonance frequency) is zero in the case of :

voltmeter $V_{1}$
voltmeter $V_{2}$
voltmeter $V_{3}$
all the three voltmeters

The correct answer is: voltmeter $V subscript 2 end subscript$

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A symmetrical converging convex lens of focal length 10 cm & diverging concave symmetrical lens of focal length - 20 cm are cut from the middle and perpendicularly and symmetrically to their principal axis. The parts thus obtained are arranged as shown in the figure. The focal length of this arrangement will be:

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In the shown figure $M subscript 1 end subscript$ and $M subscript 2 end subscript$ are two concave mirrors of the same focal length 10 cm. AB and CD are their principal axes respectively. A point object O is kept on the line AB at a distance 15 cm from $M subscript 1 end subscript$ . The distance between the mirrors is 20 cm. Considering two successive reflections first on M1 and then on $M subscript 2 end subscript$ . The distance of final image from the line AB is

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