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#1 Class 12 Physics Current Electricity 2017 Short 2M CBSE
Find the relation between internal resistance $r$, emf $E$, external resistance $R$, and the total current $I$ in the circuit.
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#2 Class 12 Physics Current Electricity 2020 Short 2M CBSE
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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#3 Class 12 Physics Current Electricity 2022 Short 5M CBSE
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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#4 Class 12 Physics Current Electricity 2021 Short 2M CBSE
Define mobility of a charge carrier. What is its relation with relaxation time?
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#5 Class 12 Physics Current Electricity 2019 Short 2M CBSE
What do you mean by sensitivity of a Wheatstone bridge? On what factors does it depend?
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#6 Class 12 Physics Current Electricity 2018 Short 1M CBSE
Define the current sensitivity of a galvanometer. Write its SI unit.
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#7 Class 12 Physics Current Electricity 2020 Short 2M CBSE
The emf of a cell is always greater than its terminal voltage. Why? Give reason.
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#8 Class 12 Physics Current Electricity 2019 Short 2M CBSE
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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#9 Class 12 Physics Current Electricity 2018 Short 1M CBSE
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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#10 Class 12 Physics Current Electricity 2022 Short 3M CBSE
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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#11 Class 12 Physics Current Electricity 2019 Short 2M CBSE
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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#12 Class 12 Physics Current Electricity 2021 Short 2M CBSE
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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#13 Class 12 Physics Current Electricity 2020 Short 1M CBSE
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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#14 Class 12 Physics Current Electricity 2018 Mcq 1M CBSE
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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#15 Class 12 Physics Current Electricity 2017 Mcq 1M CBSE
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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#16 Class 12 Physics Current Electricity 2019 Mcq 1M CBSE
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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#17 Class 12 Physics Current Electricity 2018 Short 1M CBSE
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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#18 Class 12 Physics Current Electricity 2020 Short 1M CBSE
Write the relation between drift velocity $v_d$ and applied electric field $E$ of a conductor.
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#19 Class 12 Physics Current Electricity 2019 Mcq 1M CBSE
The algebraic sum of all currents meeting at a point in an electrical circuit is
A. zero
B. infinite
C. positive
D. negative
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#20 Class 12 Physics Current Electricity 2021 Mcq 1M CBSE
If voltage across a lamp increases by 2%, then the increase in its power will be
A. 1%
B. 2%
C. 3%
D. 4%
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