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#1 Class 12 Physics Current Electricity 2025 Short 3M CBSE
(i) Derive expression for the emf induced in the loop. (ii) net magnetic force acting on unit length of conductor , due to conductors and . 3 (a) The figure given below shows three straight long parallel conductors an...
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#2 Class 12 Physics Current Electricity 2025 Short 3M CBSE
State Kirchhoff ’s rules. Using these rules, find the current flowing through branch FC in the given circuit.
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#3 Class 12 Physics Current Electricity 2025 Long 1M CBSE
Assertion (A) : The work done, in taking a unit charge around a closed loop of an electric circuit involving cells and resistors in the loop, is zero. Reason (R) : The potential at a point depends on the location of t...
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#4 Class 12 Physics Current Electricity 2025 Mcq 1M CBSE
Two identical conductors 1 and 2 are placed on two frictionless conducting rails R and S in a uniform magnetic field directed vertically downward into the plane of the page. If conductor 1 is moved with a constant vel...
A. −i
B. −j
C. k
D. j
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#5 Class 12 Physics Current Electricity 2025 Mcq 1M CBSE
Two wires of same length and same area of cross-section but made of different material of resistivities 1 and 2 are connected in series. The equivalent resistivity of the combination is :
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#6 Class 12 Physics Current Electricity 2025 Mcq 1M CBSE
A metallic rod of 1 m length is rotated with a frequency of 40 rev/s, with one end hinged at the centre and the other end at the circumference of a circular metallic ring of radius 1 m, about an axis passing through t...
A. 20 V
B. 32 V
C. 40 V
D. 63 V
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#7 Class 12 Physics Current Electricity 2025 Short 3M CBSE
(a) Establish the relation between drift velocity of electrons (vd) and electric current (I) in a conductor. (b) How is vd affected when the length of the conductor is doubled, keeping the voltage applied across the c...
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#8 Class 12 Physics Current Electricity 2025 Short 2M CBSE
(i) the resistance of the resistor. (ii) the terminal voltage of the battery. (a) In the given figure, a steady current I flows through the circuit when points A and C are connected by a wire of negligible resistance....
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#9 Class 12 Physics Current Electricity 2025 Long 1M CBSE
Assertion (A) : In a Wheatstone bridge circuit, if we interchange the position of the cell and the galvanometer, the balance condition = remains unchanged. P R Q P Reason (R) : = = so balance condition remains same. Q...
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#10 Class 12 Physics Current Electricity 2025 Mcq 1M CBSE
A square loop of side 50 cm is placed in a uniform magnetic field of 3.0 T acting perpendicular to the plane of the loop. If the loop is rotated through an angle of 90 in 0.3 s, the value of emf induced in the loop wo...
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#11 Class 12 Physics Current Electricity 2025 Short 2M CBSE
A battery of emf 6 V and internal resistance 1 is connected to a resistor. The current in the circuit is 0.5 A. Calculate 2 (i) the resistance of the resistor and (ii) the terminal voltage of the battery.
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#12 Class 12 Physics Current Electricity 2025 Mcq 1M CBSE
A lightning strike can transfer 1020 electrons from the cloud to the ground in 2 minutes. The average electric current flown from cloud to the ground is –
A. 8.0 A
B. $1.96 \times 10^{-2}$ A
C. 4.0 A
D. $1.33 \times 10^{-1}$ A
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#13 Class 12 Physics Current Electricity 2025 Short 2M CBSE
(a) Why manganin is used in wire-wound standard resistors ? Calculate the temperature at which the resistance of a wire increases by 25% of its resistance at room temperature 27.5 C ? The temperature coefficient of re...
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#14 Class 12 Physics Current Electricity 2025 Short 2M CBSE
Calculate the temperature at which the resistance of a conductor becomes 20% more than its resistance at 27 C. The value of the temperature coefficient of resistance of the material of conductor is $2.0 \times 10^{-4}...
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#15 Class 12 Physics Current Electricity 2025 Short 3M CBSE
(iii) 80.00 cm (A) 15.50 cm (B) 18.75 cm (C) 20.50 cm (D) 22.75 cm (iv) 15 cm (A) 45 cm (B) 50 cm (C) 55 cm (D) 65 cm (a) Explain the statement : “Current is a scalar although we represent current with an arrow”. 3 (b...
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#16 Class 12 Physics Current Electricity 2025 Short 2M CBSE
A heating element using nichrome is connected to a 220 V supply. Initially it draws a current of 2.9 A. After some time, the current attains a steady value of 2.5 A. Find the steady temperature of the heating element ...
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#17 Class 12 Physics Current Electricity 2025 Long 1M CBSE
Assertion (A) : Two electric heaters of power P$_{1}$ and P$_{2}$ (> P$_{1}$) are joined in series across a dc source of voltage V. The power consumed by the combination will be less than that consumed by P$_{1}$ when...
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#18 Class 12 Physics Current Electricity 2025 Mcq 1M CBSE
A galvanometer of resistance 27 is converted into an ammeter of range (0 – 10 mA) using a resistance of 3 . The galvanometer will show full scale deflection for a current of about –
A. 10 mA
B. 100 mA
C. 1 mA
D. 3 mA
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#19 Class 12 Physics Current Electricity 2025 Mcq 1M CBSE
A copper wire is stretched to increase its length by 1%. Then the change in its resistance is close to
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#20 Class 12 Physics Current Electricity 2025 Short 5M CBSE
(a) An electric dipole consists of two point charges q and –q separated by a distance 2a. Derive an expression for the electric field E due to this dipole at a point distant r from the centre of the dipole on the equa...
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