NEET Physics Current Electricity MCQs

The drift velocity of electrons in a conductor is of the order of:

If the current in a conductor is doubled, keeping the area of cross-section and the number density of charge carriers constant, the drift velocity:

How does the relaxation time of electrons in a conductor affect drift velocity?

Two wires, A and B, made of the same material and having the same length, carry the same current. If the cross-sectional area of A is twice that of B, the ratio of their drift velocities ($v_{dA} : v_{dB}$) is:

The direction of drift velocity of electrons in a metallic conductor is:

Two resistors of resistances $R_1$ and $R_2$ are connected in parallel. A third resistor of resistance $R_3$ is connected in series with this parallel combination. If $R_1 = 4 \Omega$, $R_2 = 6 \Omega$, and $R_3 = 3 \Omega$, what is the total equivalent resistance of the circuit?

Three identical resistors, each of resistance R, are connected. Which combination will result in the least equivalent resistance?

A wire of resistance $10 \Omega$ is bent into a circle. What is the equivalent resistance across its diameter?

In a circuit with resistors in parallel, which of the following remains constant across each resistor?

Two resistors $4\Omega$ and $6\Omega$ are connected in parallel. This combination is then connected in series with a $2\Omega$ resistor. If the total current flowing through the $2\Omega$ resistor is 3A, what is the potential difference across the $4\Omega$ resistor?