List of top Physics Questions on Resistance asked in JEE Main

In an experiment of CE configuration of n–p–n transistor, the transfer characteristics are observed as given in figure.

In an experiment of CE configuration of n–p–n transistor

If the input resistance is 200 Ω and output resistance is 60 Ω, the voltage gain in this experiment will be______.

A potentiometer wire of length 10 m and resistance 20 Ω is connected in series with a 25 V battery and an external resistance 30 Ω. A cell of emf E in secondary circuit is balanced by 250 cm long potentiometer wire. The value of E (in volt) is $\frac {x}{10}$. The value of $x$ is ______.

A 220 V, 50 Hz AC source is connected to a 25 V, 5 W lamp and an additional resistance R in series (as shown in figure) to run the lamp at its peak brightness, then the value of R (in ohm) will be _____ .

A cell, shunted by a 8 Ω resistance, is balanced across a potentiometer wire of length 3 m. The balancing length is 2 m when the cell is shunted by 4 Ω resistance. The value of internal resistance of the cell will be _____ Ω.

The current density in a cylindrical wire of radius 4 mm is $4×10^6\ Am^{–2}$. The current through the outer portion of the wire between radial distances $\frac R2$ and $R$ is _____ $\pi$ A.

In the given circuit ‘a‘ is an arbitrary constant. The value of m for which the equivalent circuit resistance is minimum, will be $\frac{\sqrt x}{2}$.The value of x is________.

The cut-off voltage of the diodes (shown in figure) in forward bias is $0.6\; V$. The current through the resistor of $40$ $Ω$ is____ mA.

All resistances in figure are 1 Ω each. The value of current ‘I‘ is $(\frac{a}{5})$ A. The value of a is _______.

In a coil of resistance $8Ω$, the magnetic flux due to an external magnetic field varies with time as $Φ=\frac{2}{3}(9−t^2)$.The value of total heat produced in the coil, till the flux becomes zero, will be _ $J$.

A potentiometer wire of length 300 cm is connected in series with a resistance 780 Ω and a standard cell of emf 4V. A constant current flows through potentiometer wire. The length of the null point for cell of emf20 mV is found to be 60 cm. The resistance of the potentiometer wire is _____ Ω.

The actual value of resistance $R$, shown in the figure is $30 \Omega $. This is measured in an experiment as shown using the standard formula $R = \frac{V}{I}$ , where $V$ and $I$ are the readings of the voltmeter and ammeter, respectively. If the measured value of $R$ is $5\%$ less, then the internal resistance of the voltmeter is :

Two equal resistance when connected in series to a battery, consume electric power of $60\, W$. If these resistances are now connected in parallel combination to the same battery, the electric power consumed will be :

The supply voltage in a room is $120\, V$. The resistance of the lead wires is $6 \, \Omega$. A $60\, W$ bulb is already switched on. What is the decrease of voltage across the bulb, when a $240\, W$ heater is switched on in parallel to the bulb?

A 5V battery with internal resistance 2Ω and a 2V battery with internal resistance 1Ω are connected to a 10Ω resistor as shown in the figure. The current in the 10Ω resistor is

A galvanometer has a resistance of 96 Ω and it is desired to pass 4% of the total current through it. The value of shunt resistance is ____?

A cubical arrangement of 12 resistors each having resistance R is shown. Find I.

Consider the network shown:

The equivalent resistance of the network is

20R resistance wire is cut into 10 equal parts. Now each part first is connected in series and then in parallel. Find ratio of equivalent resistance in both cases (Rseries : Rparallel)

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

The resistance $ R = \frac{V}{I} $ where $ V = (200 \pm 5) \, \text{V} $ and $ I = (20 \pm 0.2) \, \text{A} $. The percentage error in the measurement of $ R $ is: