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qUESTIONS

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

MCQs-PYQs-12th-jee

Three coplanar, parallel, long straight wires are equally spaced, that is, the distance between each pair of successive wires is the same. the first and the third wire carry currents of 1 a each, in the same direction. what must be the current in the second wire (wire in the middle), so that the other two wires do not feel any net force?

MCQs-PYQs-12th-jee

Three long straight wires are connected parallel to each other across a battery of negligible internal resistance. The ratio of their resistances are 3 : 4 : 5. What is the ratio of distances of middle wire from the others if the net force experienced by it is zero

MCQs-PYQs-12th-jee

Two infinitely long parallel wires carry currents of magnitude I1 and I2 and are at a distance 4 cm apart. The magnitude of the net magnetic field is found to reach a non-zero minimum values between the two wires and 1 cm away from the first wire. The ratio of the two currents and their mutual direction is

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