List of top Physics Questions on Resistance

What is the potential drop between points A and C in the following circuit ? Resistances $1 \, \Omega $ and $2 \, \Omega $ represent the internal resistances of the respective cells.

Two copper wires of length $ l $ and $2 l $ have radii $r$ and $2r$ respectively. What is the ratio of their specific resistances?

Two copper wires of length $ l $ and $2 l $ have radii $r$ and $2r$ respectively. What is the ratio of their specific resistances?

The equivalent resistance between the points P and Q in the network shown in the figure is given by:

The magnitude of $I$ in ampere unit is

The practical unit of resistance is $ \Omega .1 \, \Omega $ is equal to:

A milliammeter of range 10 mA has a coil of resistance $1\Omega$. To use it as a voltmeter of range 10 V, the resistance that must be connected in series with it is

The resistance of an ideal ammeter is

You are provided three bulbs of 15, 40 and 60 watt. Which of them has lowest resistance:

Three similar cells, each of emf 2 V and internal resistance $r\,\Omega$ send the same current through an external resistance of $2\,\Omega$ when connected in series or in parallel. The strength of the current flowing through the external resistance is (A)

A wire of resistance 12 ohm is in the form of a circle. The resistance between the ends of a diameter is :

The ammeter A reads 2 A and the voltmeter V reads 20 V. The value of resistance R is:

A voltmeter has a range 0-V with a series resistance R. With a series resistance 2 R, the range is 0-V'. The correct relation between V and V' is

A galvanometer of 100 $ \Omega $ resistance gives full scale deflection with 0.01 A current. How much resistance should be connected to convert it into an ammeter of range , 10 A :

A galvanometer has a resistance G and a current flowing in it produces full scale deflection. \(S_1\) is the value of the shunt, which converts it into an ammeter of range \(0-I\) and \(S_2\) is the value of the shunt for the range \(0-2I\). The ratio is

All the resistors are equal in value each being 2 ohm. The equivalent resistance of the combination is:

If 11 identical resistances each of resistance r ohm are in parallel, the equivalent resistance of the combination would be:

Two resistances $R_1$ and $R_2$ have effective resistance $R_s$ when connected in series and $R_p$, when connected in parallel. If $R_s R_p=16$ and $R_1/R_2=4$, calculate the values of $R_1$and $R_2$ (in units of resistance).

AB is a uniform wire of resistance $2000\,\Omega$ and C is the midpoint of Ag^A voltmeter of resistance $1000\,\Omega$ is connected between A arid B.. Then the reading of the voltmeter, when the p.d. is applied across AB is 150 V, is

A galvanometer of 25 ohms and having full scale deflection for a current of 10 mA is changed into voltmeter of range 100 volts by connecting a resistance R in series with the galvanometer. The resistance R in ohms is:

What is the resistance between A and B in the figure:

In a region of magnetic induction B =$10^2$ tesla, a circular coil of radius 30 cm and resistance $\pi^2$ ohm is rotated about an axis which is perpendicular to the direction of B and which forms a diameter of the coil. If the coil rotates at 200 rpm the amplitude of the alternating current induced in the coil is

Masses of three wires of copper are in the ratio of $1 : 3 : 5$ and their lengths are in the ratio of $5 : 3 : 1$. The ratio of their electrical resistances is

The plate resistance of a triode is $3 \times 10^3 \Omega$ and its mutual conductance is $1.5 \times 10^{-3} A/V$. The amplification factor of the triode is

Find the equivalent resistance between terminal A and B for the given network.