List of top Physics Questions on Electrical Circuits

Two p-n junction diodes $D_1$ and $D_2$ are connected as shown in the figure. $A$ and $B$ are input signals and $C$ is the output. The given circuit will function as a _______.

In a vernier calipers 50 VSD are equal to 48 MSD. 1 MSD is equal to $0.05$ mm. Find least count of this vernier calipers.

A positive ion A and a negative ion B has charges $6.67 \times 10^{-19}$ C and $9.6 \times 10^{-10}$ C, and masses $19.2 \times 10^{-27}$ kg and $9 \times 10^{-27}$ kg respectively. At an instant, the ions are separated by a certain distance $r$. At that instant, the ratio of the magnitudes of electrostatic force to gravitational force is $P \times 10^{-13}$, where the value of $P$ is:

Two batteries of emf's $3V \& 6V$ and internal resistances 0.2 Ω $\&$ 0.4 Ω are connected in parallel. This combination is connected to a 4 Ω resistor. Find:
(i) the equivalent emf of the combination
(ii) the equivalent internal resistance of the combination
(iii) the current drawn from the combination

Four resistors, each of resistance R and a key K are connected as shown in the figure. The equivalent resistance between points A and B when key K is open will be:

A motor operating on 100 V draws a current of 1 A. If the efficiency of the motor is 91.6%, then the loss of power in units of cal/s is

In the given circuit the sliding contact is pulled outwards such that the electric current in the circuit changes at the rate of 8 A/s. At an instant when R is 12 Ω, the value of the current in the circuit will be A.

Two particles are located at equal distance from origin. The position vectors of those are represented by $ \vec{A} = 2\hat{i} + 3\hat{j} + 2\hat{k} $ and $ \vec{B} = 2\hat{i} - 2\hat{j} + 4\hat{k} $, respectively. If both the vectors are at right angle to each other, the value of $ n^{-1} $ is:

The value of current $ I $ in the electrical circuit as given below, when the potential at $ A $ is equal to the potential at $ B $, will be ________________________ A.

The waves emitted when a metal target is bombarded with high energy electrons are:

In meter bridge or Wheatstone bridge for measurement of resistance, the known and the unknown resistance are interchanged. The error so removed is:

In the given circuit, the rms value of current ($ I_{\text{rms}} $) through the resistor $ R $ is:

Choose the correct option from the following options given below:

Figure shows a circuit that contains four identical resistors with resistance R=2.0 Ω, two identical inductors with inductance L=2.0 mH and an ideal battery with emf E=9 V. The current 'i' just after the switch 'S' is closed will be :

The current (i) at time t=0 and t=∞ respectively for the given circuit is :

The circuit shown in the figure consists of a charged capacitor of capacity 3 µF and a charge of 30 µC. At time t=0, when the key is closed, the value of current flowing through the 5 MΩ resistor is 'x' µA. The value of 'x' to the nearest integer is __________.