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qUESTIONS

The resistance of the series combination of two resistances is S. When they are joined in parallel the total resistance is P. If S = nP, then the minimum possible value of n is [2004]

In the given circuit, it is observed that the current I is independent of the value of the resistance R6. Then the resistance values must satisfy [2001]

The current I drawn from the 5 volt source will be [2018]

In a Wheatstone’s bridge, three resistance P, Q and R are connected in the three arms and the fourth arm is formed by two resistances S₁ and S2 connected in parallel. The condition for the bridge to be balanced will be [2006]

The effective resistance between points P and Q of the electrical circuit shown in the figure is [2002]

An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii of the wires are in the ratio of 4/3 and 2/3, then the ratio of the currents passing through the wire will be [2004]

The total current supplied to the circuit by the battery is [2004]

In the above circuit the current in each resistance is [2017]

Two batteries with e.m.f. of 12V and 13V are connected in parallel across a load resistor of 10 ohm. The internal resistance of the two batteries are 12 and 20 respectively. The voltage across the load lies between [2018]

A wave in a string has an amplitude of 2 cm. The wave travels in the +ve direction of x axis with a speed of 128 m/sec and it is noted that 5 complete waves fit in 4 m length of the string. The equation describing the wave is

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