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#1 Class Class 12 Physics Current Electricity 2022 Long 5M

Write two limitations of Ohm's law. Sketch their $I$-$V$ characteristics.

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#2 Class Class 12 Physics Current Electricity 2023 Long 5M

(I) Currents $I_1$, $I_2$, $I_3$ at a junction satisfy $I_1 = I_2 + I_3$. (A) State the fundamental law from which this is derived. (B) Explain how Kirchhoff's Voltage Law validates conservation of energy. (II) How do...

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#3 Class Class 12 Physics Current Electricity 2017 Short 2M

Find the relation between internal resistance $r$, emf $E$, external resistance $R$, and the total current $I$ in the circuit.

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#4 Class Class 12 Physics Current Electricity 2020 Short 2M

The graph shows potential difference $V$ across terminals of a cell against load current $I$. How do you find emf and internal resistance from this graph?

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#5 Class Class 12 Physics Current Electricity 2022 Short 5M

Define current density and relaxation time. Derive an expression for resistivity of a conductor in terms of number density of charge carriers $n$ and relaxation time $\tau$.

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#6 Class Class 12 Physics Current Electricity 2021 Short 2M

Define mobility of a charge carrier. What is its relation with relaxation time?

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#7 Class Class 12 Physics Current Electricity 2019 Short 2M

What do you mean by sensitivity of a Wheatstone bridge? On what factors does it depend?

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#8 Class Class 12 Physics Current Electricity 2018 Short 1M

Define the current sensitivity of a galvanometer. Write its SI unit.

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#9 Class Class 12 Physics Current Electricity 2020 Short 2M

The emf of a cell is always greater than its terminal voltage. Why? Give reason.

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#10 Class Class 12 Physics Current Electricity 2019 Short 2M

Nichrome and Copper wires of same length and same radius are connected in series. Current $I$ is passed through them. Which wire gets heated up more? Justify your answer.

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#11 Class Class 12 Physics Current Electricity 2018 Short 1M

Write the expression for the drift velocity of charge carriers in a conductor of length $L$ across which a potential difference $V$ is applied.

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#12 Class Class 12 Physics Current Electricity 2022 Short 3M

A coil contains $N$ turns of insulated copper wire of diameter $d$ and resistivity $\rho$ wound on a cylinder of diameter $D$. What is the total resistance between the two ends of the coil? (Given: $D \gg d$)

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#13 Class Class 12 Physics Current Electricity 2019 Short 2M

Internal resistance of a cell of emf 12 V is 0.05 $\Omega$. Find the voltage across the cell when a current of 60 A is drawn from it.

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#14 Class Class 12 Physics Current Electricity 2021 Short 2M

A battery of 12 V and internal resistance 0.5 $\Omega$ is connected across a variable resistance $R$. Find the value of $R$ for which the power delivered to $R$ is maximum.

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#15 Class Class 12 Physics Current Electricity 2020 Short 1M

The $V$-$I$ graphs for a conductor at two different temperatures $T_1$ and $T_2$ are shown in figure. The steeper slope corresponds to $T_1$. Write the relation between $T_1$ and $T_2$.

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#16 Class Class 12 Physics Current Electricity 2018 Mcq 1M

If the length of a conductor is halved, then its conductance will be

A. halved

B. doubled

C. quadrupled

D. unchanged

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#17 Class Class 12 Physics Current Electricity 2017 Mcq 1M

The internal resistance of a cell is the actual resistance of

A. electrodes of the cell

B. vessel of the cell

C. material used in the cell

D. electrolyte used in the cell

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#18 Class Class 12 Physics Current Electricity 2019 Mcq 1M

An energy source will supply a constant current into the load, if its internal resistance is

A. zero

B. equal to load resistance

C. very large compared to load resistance

D. non-zero but less than load resistance

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#19 Class Class 12 Physics Current Electricity 2018 Short 1M

If the resistivity of an alloy is $\rho'$ and that of its constituent metal is $\rho$, state the relation between them.

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#20 Class Class 12 Physics Current Electricity 2020 Short 1M

Write the relation between drift velocity $v_d$ and applied electric field $E$ of a conductor.

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