List of top Physics Questions on Current electricity asked in MET

The temperature coefficient of resistance of a wire is 0.00125 °C\(^{-1}\). At 300 K, its resistance is 1 \(\Omega\). At what temperature the resistance of the wire will be 2 \(\Omega\)?

The starter motor of a car draws a current \(I = 300\) A from the battery of voltage 12 V. If the car starts only after 2 minutes, what is the energy drawn from the battery?

Consider four circuits shown in the figure below. In which circuit power dissipated is greatest? (Neglect the internal resistance of the power supply).

Find the equivalent resistance across AB

A uniform wire of resistance $9\Omega$ is cut into 3 equal parts. They are connected in the form of equilateral triangle ABC. A cell of emf 2V and negligible internal resistance is connected across B and C. Potential difference across AB is

In a potentiometer experiment two cells of emf $E_{1}$ and $E_{2}$ are used in series and in conjunction and the balancing length is found to be $58~\mathrm{cm}$ of the wire. If the polarity of $E_{2}$ is reversed, then the balancing length becomes $29~\mathrm{cm}$. The ratio $\frac{E_1}{E_2}$ of the emfs of the two cells is}

Voltage and current in an AC circuit are given by $V = 5\sin \left(100\pi t - \frac{\pi}{6}\right)$ and $I = 4\sin \left(100\pi t + \frac{\pi}{6}\right)$

An electric motor operates on a $50~\mathrm{V}$ supply and a current of $12\mathrm{A}$. If the efficiency of the motor is $30%$, what is the resistance of the winding of the motor?

A galvanometer of resistance $20\Omega$ is to be converted into an ammeter of range $1\mathrm{A}$. If a current of $1\mathrm{mA}$ produces full scale deflection, the shunt required for the purpose is}

A wire of length $100~\mathrm{cm}$ is connected to a cell of emf $2\mathrm{V}$ and negligible internal resistance. The resistance of the wire is $3\Omega$. The additional resistance required to produce a potential difference of $1\mathrm{mV / cm}$ is}

In the figure a carbon resistor has bands of different colours on its body as mentioned in the figure. The value of the resistance is}

The magnitude of current $i$ in ampere unit is}

A sinusoidal voltage of peak value 300 V and an angular frequency \(\omega = 400\) rad/s is applied to a series \(L\)-\(C\)-\(R\) circuit in which \(R = 3\ \Omega\), \(L = 20\) mH and \(C = 625\ \mu\)F. The peak current in the circuit is

In the adjoining circuit, the resistances are given in ohm, and \(X\) and \(Y\) are unknown resistances. The current through the 10 \(\Omega\) resistance is 3A while that through the resistance \(X\) is 1A. No current passes through the galvanometer. The values of the unknown resistances \(X\) and \(Y\) are respectively}

A voltmeter of resistance 998 \(\Omega\) is connected across a cell of emf 2 V and internal resistance 2\(\Omega\). The potential difference across the voltmeter is

Three 2 \(\Omega\) resistors are connected to form a triangle. The resistance between any two corners is

A cell of emf \(E\) is connected across a resistance \(R\). The potential difference between the terminals of the cell is found to be \(V\). The internal resistance of the cell must be

A voltmeter has resistance of \(G\) ohms and range \(V\) volts. The value of resistance used in series to convert it into a voltmeter of range \(nV\) volts is

The ratio of the resistance of conductor at temperature 15\(^\circ\)C to its resistance at temperature 37.5\(^\circ\)C is 4:5. The temperature coefficient of resistance of the conductor is

Two identical cells whether connected in parallel or in series gives the same current when connected to an external resistance 1.5 \(\Omega\). Find the value of internal resistance of each cell.

If 10% of the main current is to be passed through the moving coil galvanometer of resistance $99Ω$, then the required shunt resistance will be:

Two capacitors of capacitances $3~μ F$ and $6~μ F$ are charged to a potential of 12 V each. They are now connected to each other, with the positive plate of each joined to the negative plate of the other. The potential difference across each will be:

In a potentiometer experiment for measuring the emf of a cell, the null point is at 240 cm when we have a 500 Ω resistor in series with the cell and galvanometer. If the series resistance is reduced to half, then the null point will be at:

Particles which can be added to the nucleus of an atom without changing its chemical properties are:

What will be the kinetic energy of an electron having de-Broglie wavelength 2Å?