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qUESTIONS

MCQs-PYQs-12th-jee

In a metre bridge experiment, resistances are connected as shown in figure. The balancing length l1 is 55 cm. Now an unknown resistance x is connected in series with P and the new balancing length is found to be 75 cm. The value of x is

Two resistances are connected in two gaps of a metre bridge. The balance point is 20 cm from the zero end. A resistance of 15 ohms is connected in series with the smaller of the two. The null point shifts to 40 cm. The value of the smaller resistance in ohms is

A resistance R is to be measured using a meter bridge, student chooses the standard resistance S to be 100Ω. He finds the null point at 1₁ = 2.9cm. He is told to attempt to improve the accuracy. Which of the following is a useful way?

An unknown resistance R1 is connected in series with a resistance of 10 Ω. This combinations is connected to one gap of a metre bridge while a resistance R2 is connected in the

A galvanometer can be converted into an ammeter by connecting

When a 12Ω resistor is connected with a moving coil galvanometer then its deflection reduces from 50 divisions to 10 divisions. The resistance of the galvanometer is

In the diagram shown, the reading of voltmeter is 20 V and that of ammeter is 4 A. The value of R should be (Consider given ammeter and voltmeter are not ideal)

An ammeter with internal resistance 900 Ω reads 1.85 A when connected in a circuit containing a battery and two resistors 700Ω and 410Ω in series. Actual current will be

We have a galvanometer of resistance 25 Ω. It is shunted by a 2.5 Ω wire. The part of total current that flows through the galvanometer is given as

The resistance of a galvanometer coil is R. What is the shunt resistance required to convert it into an ammeter of range 4 times

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