- [Easy]When the temperature of a pure metallic conductor is raised, which statement correctly describes the resulting change in its electrical conductivity?...
- [Medium]A uniform conductor carries a steady current, and its length is doubled by stretching while the volume of material remains constant. By what factor do...
- [Easy]A carbon resistor carries coloured bands in the sequence yellow, violet, orange, and gold. What is its resistance together with the stated tolerance?...
- [Medium]A potentiometer wire balances the EMF of one cell at a length of 240 cm and that of a second cell at 160 cm under identical conditions. What is the ra...
- [Easy]An incandescent bulb rated 60 W is designed to operate on a 240 V supply. What is the resistance of its filament at operating conditions?...
- [Medium]A galvanometer of resistance 20 \(\Omega\) shows full-scale deflection at 5 mA. What series resistance turns it into a voltmeter capable of reading up...
- [Medium]A galvanometer of resistance 50 \(\Omega\) gives full-scale deflection for 4 mA. What shunt resistance converts it into an ammeter reading up to 2 A a...
- [Easy]An electric geyser rated 2 kW is used for 1.5 hours each day. How much electrical energy in kilowatt-hours does it consume over a 30-day month?...
- [Medium]In a meter-bridge experiment, the balance point for an unknown resistance is obtained at 40 cm from the left end when the known resistance in the righ...
- [Medium]Three identical cells, each of EMF 1.5 V and internal resistance 0.2 \(\Omega\), are connected in series across an external resistance of 4.4 \(\Omega...
- [Medium]Three arms of a Wheatstone bridge contain resistances of 4 \(\Omega\), 8 \(\Omega\), and 6 \(\Omega\) in order, and the galvanometer shows no deflecti...
- [Medium]A metallic coil has a resistance of 50 \(\Omega\) at 20 \(^\circ\)C and a temperature coefficient of resistance of \(4 \times 10^{-3}\) per \(^\circ\)...
- [Medium]A battery of EMF 12 V and internal resistance 0.5 \(\Omega\) is connected to an external resistor of 5.5 \(\Omega\). What is the terminal voltage acro...
- [Medium]Two resistors of 6 \(\Omega\) and 3 \(\Omega\) are joined in parallel, and this combination is connected in series with a 4 \(\Omega\) resistor. What ...
- [Easy]A nichrome heating element draws a steady current of 2.5 A when connected across a 220 V domestic supply. What is its operating resistance?...
- [Medium]A copper wire of cross-sectional area \(2 \times 10^{-6}\) m\(^2\) carries a current of 3.2 A, with a free-electron density of \(1.0 \times 10^{29}\) ...
- [Easy]Three cells each of EMF 2 V and internal resistance 1 Ω are connected in series. What is the total EMF and internal resistance?...
- [Medium]In a meter bridge, a known resistance of 6 Ω in the right gap is balanced by an unknown resistance in the left gap. If the balance point is at 40 cm f...
- [Easy]Two resistors of 6 Ω and 3 Ω are connected in parallel. What is the equivalent resistance?...
- [Medium]The resistance of a conductor at 0°C is 10 Ω. If the temperature coefficient of resistance is 0.004/°C, what is the resistance at 100°C?...
- [Easy]If the drift velocity of electrons in a conductor is v, what happens to it when the current is doubled (assuming constant cross-section)?...
- [Medium]A cell of EMF 12 V and internal resistance 2 Ω is connected to an external resistance of 10 Ω. What is the terminal voltage?...
- [Easy]A 5 Ω resistor carries a current of 4 A. What is the power dissipated in the resistor?...
- [Easy]Three resistors of 2 Ω, 3 Ω, and 5 Ω are connected in series. What is the equivalent resistance?...
- [Easy]A resistor of 10 Ω carries a current of 2 A. What is the potential difference across it?...
- [Medium]Energy delivered by cell with EMF E and charge Q passed is:...
- [Hard]Resistance R(T)=R0(1+αT). For small α, fractional change per degree is approximately:...
- [Medium]Potentiometer measures EMF accurately because it draws:...
- [Hard]EMF of cell best defined as:...
- [Hard]Balanced Wheatstone bridge condition:...
- [Easy]Resistivity of metals with temperature typically:...
- [Easy]Electric current I is rate of flow of:...
- [Easy]Ohm's law states V proportional to:...
- [Easy]Resistance R of wire length L area A is:...
- [Easy]Equivalent resistance of two resistors R and 2R in series is:...
- [Medium]Equivalent resistance of R and 2R in parallel is:...
- [Easy]Power dissipated in resistor is:...
- [Medium]Kirchhoff's current law states algebraic sum of currents at junction is:...
- [Medium]Sum of potential differences around closed loop is:...
- [Medium]Drift velocity v_d relates current by I = n A e v_d. Increasing cross-sectional area keeping current same makes v_d:...
- [Easy]In a potentiometer experiment, the balancing length for a cell of EMF 1.5V is 60cm. If the cell is replaced by another cell of EMF E, the balancing le...
- [Easy]The resistance of each arm of the Wheatstone bridge is 10 Ohm. A resistance of 10 Ohm is connected in series with galvanometer. The equivalent resista...
- [Easy]In the given circuit, find the value of current I....