List of top Physics Questions on Circuits and Ohm’s Law

When an external resistance of 5 \(\Omega\) is connected across terminals of a cell, a current of 0.25 A flows through it. When the 5 \(\Omega\) resistor is replaced by a 2 \(\Omega\) resistor, a current of 0.5 A flows through it. The internal resistance of the cell is \dots \(\Omega\).
Two resistors of 200 \( \Omega \) and 400 \( \Omega \) are connected in series with a battery of 100 V. A bulb rated at 200 W, 100 V is connected across the 400 \( \Omega \) resistance. The potential drop across the bulb is _______ V.}
Two cells of emfs \(1\,\text{V}\) and \(2\,\text{V}\) and internal resistances \(2\,\Omega\) and \(1\,\Omega\) respectively connected in parallel, gave a current of \(1\,\text{A}\) through an external resistance. If the polarity of one cell is reversed, the current through the external resistance will be \( \frac{\alpha}{5} \) A. The value of \( \alpha \) is _____.
Refer to the figure given below. The values of $I_1, I_2$ and $I_3$ are ______}

What is the current through the battery in the circuit shown below? 

The electric flux is \( \varphi = \alpha \sigma + \beta \lambda \) where \( \lambda \) and \( \sigma \) are linear and surface charge density, respectively, and \( \left( \frac{\alpha}{\beta} \right) \) represents

Refer to the circuit diagram given in the figure, which of the following observations are correct?

 

Observations:

A. Total resistance of circuit is 6 Ω

B. Current in Ammeter is 1 A

C. Potential across AB is 4 Volts

D. Potential across CD is 4 Volts

E. Total resistance of the circuit is 8 Ω

Choose the correct answer from the options given below: