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#1 Class 12 Physics Current Electricity 2019 Short 3M CBSE
The resistance of a conductor is 6 $\Omega$ at 50°C and 7 $\Omega$ at 100°C. Calculate the mean temperature coefficient $\alpha$ and resistance at 0°C.
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#2 Class 12 Physics Current Electricity 2022 Short 3M CBSE
A current of 1.8 A flows through a wire of cross-section 0.5 mm$^2$. Find: (a) current density, (b) drift velocity. (Number density $n = 8.8 \times 10^{28}$ m$^{-3}$)
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#3 Class 12 Physics Current Electricity 2021 Short 2M CBSE
A current of 10 A is maintained in a conductor of cross-section $10^{-4}$ m$^2$. If number density of free electrons is $9 \times 10^{28}$ m$^{-3}$, calculate the drift velocity. ($e = 1.6 \times 10^{-19}$ C)
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#4 Class 12 Physics Current Electricity 2020 Short 2M CBSE
A wire of resistance 4 $\Omega$ is stretched to twice its original length. What will be the resistance of the stretched wire?
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#5 Class 12 Physics Current Electricity 2019 Short 2M CBSE
In a hydrogen atom, the electron makes about $0.6 \times 10^{16}$ revolutions per second around the nucleus. Determine the average current at any point on the orbit.
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#6 Class 12 Physics Current Electricity 2021 Short 2M CBSE
If charge $q = t^2 + 2t$ (in coulombs), find: (a) Current $i$ at $t = 2$ s (b) Average current from $t = 0$ to $t = 2$ s
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#7 Class 12 Physics Current Electricity 2022 Short 5M CBSE
(i) Derive an expression for drift velocity of free electrons. (ii) How does drift velocity vary with increase in temperature? Explain.
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#8 Class 12 Physics Current Electricity 2023 Short 5M CBSE
Define current density $J$ of a metallic conductor. Deduce the relation connecting $J$ and conductivity $\sigma$ when electric field $E$ is applied.
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#9 Class 12 Physics Current Electricity 2022 Short 3M CBSE
A wire of uniform cross-section and resistance 4 $\Omega$ is bent into a square ABCD. Point A is connected to point P on DC by a wire AP of resistance 1 $\Omega$. When potential difference is applied between A and C, ...
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#10 Class 12 Physics Current Electricity 2019 Short 3M CBSE
A heating element using nichrome connected to a 230 V supply draws initial current of 3.2 A which settles to 2.8 A. Find steady temperature if room temperature is 27°C. ($\alpha_{nichrome} = 1.70 \times 10^{-4}$ °C$^{...
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#11 Class 12 Physics Current Electricity 2021 Short 3M CBSE
A wire of uniform cross-section and resistance 12 $\Omega$ is bent in the shape of a circle. A resistance of 10 $\Omega$ is connected to diametrically opposite ends C and D. A battery of emf 8 V is connected between A...
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#12 Class 12 Physics Current Electricity 2022 Short 5M CBSE
Using Kirchhoff's laws, obtain the equation for the balanced state in a Wheatstone bridge.
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#13 Class 12 Physics Current Electricity 2023 Short 3M CBSE
A heating element connected across a battery of 100 V having internal resistance 1 $\Omega$ draws initial current of 10 A at 20°C. What is the power consumed by battery itself after steady temperature of 320°C? ($\alp...
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#14 Class 12 Physics Current Electricity 2022 Long 5M CBSE
Write two limitations of Ohm's law. Sketch their $I$-$V$ characteristics.
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#15 Class 12 Physics Current Electricity 2023 Long 5M CBSE
(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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#16 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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#17 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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#18 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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#19 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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#20 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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