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#1 Class 12 Physics Moving Charges and Magnetism 2025 Short 3M CBSE
Derive an expression for the magnetic field B, due to a circular coil of N turns, each of radius r carrying current I, at a distance ‘x’ from the centre along its axis.
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#2 Class 12 Physics Moving Charges and Magnetism 2025 Mcq 1M CBSE
A magnet held vertically, with its north pole down is dropped along the axis of a closed solenoid placed vertically on a table. If the observer looks down from the top,
A. the induced current will flow in the anticlockwise direction
B. the induced current will flow in the clockwise direction
C. no induced current will flow in the solenoid
D. the magnet will fall with a constant velocity
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#3 Class 12 Physics Moving Charges and Magnetism 2025 Mcq 1M CBSE
A straight long wire lying along y-axis, carries a current of 1 A along –y direction. The magnetic field due to the conductor at a point (50 cm, 0, 0) will point along.
A. z-axis
B. –z-axis
C. x-axis
D. –x-axis
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#4 Class 12 Physics Moving Charges and Magnetism 2025 Mcq 1M CBSE
A circular loop has radius R and carries current I as shown in figure. In order that the net magnetic field at the centre of the loop is zero, the current in wire AB should have magnitude
A. 2I, along +X – axis
B. 2I along –X – axis
C. I along +X – axis
D. I along –X – axis
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#5 Class 12 Physics Moving Charges and Magnetism 2025 Mcq 1M CBSE
A straight conductor lies along x-axis. It carries a current of 10 A along +x direction. The magnetic field B due to 1 cm segment of this conductor, centred at the origin, at a point (0, 1 m, 0) is
A. (1 nT) ĵ
B. (10 nT) k^
C. – (10 nT) k^
D. – (1 nT) ĵ
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#6 Class 12 Physics Moving Charges and Magnetism 2025 Short 2M CBSE
A wire of length L is bent round into (i) a square coil having N turns and (ii) a circular coil having N turns. The coil in both cases is free to turn about a vertical axis coinciding with the plane of the coil, in a ...
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#7 Class 12 Physics Moving Charges and Magnetism 2025 Long 1M CBSE
Assertion (A) : All atoms have a net magnetic moment. 1 Reason (R) : A current loop does not always behave as a magnetic dipole.
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#8 Class 12 Physics Moving Charges and Magnetism 2025 Mcq 1M CBSE
A long straight wire of circular cross-section (radius a) carries a steady current I. The current is uniformly distributed across this cross-section. The magnitude of the magnetic field produced at a point at a distan...
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#9 Class 12 Physics Current Electricity 2025 Short 5M CBSE
(i) Derive the condition for which a Wheatstone Bridge is balanced. () (ii) 20C 1.05 100C 1.38 (a)
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#10 Class 12 Physics Current Electricity 2025 Mcq 1M CBSE
A square loop of side 0.50 m is placed in a uniform magnetic field of 0.4 T perpendicular to the plane of the loop. The loop is rotated through an angle of 60 in 0.2 s. The value of emf induced in the loop will be :
A. 5V
B. 3.5 V
C. 2.5 V
D. Zero V
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#11 Class 12 Physics Current Electricity 2025 Short 2M CBSE
A square loop of side 10 cm, free to rotate about a vertical axis coinciding with its one arm, is initially held perpendicular to a uniform horizontal magnetic field of 0.2 T. If it is rotated at the uniform speed of ...
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#12 Class 12 Physics Current Electricity 2025 Short 5M CBSE
(i) Consider a cylindrical conductor of length l and area of cross-section A. Current I is maintained in the conductor and electrons drift with velocity vd ( v d = ), (where symbols have their usual meanings). Show th...
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#13 Class 12 Physics Current Electricity 2025 Short 2M CBSE
(i) its resistance, and (ii) heat produced by it in 10 minutes. (a) An electric iron rated 2.2 kW, 220 V is operated at 110 V supply. Find : 2 (b) A current of 4.0 A flows through a wire of length 1 m and cross-sectio...
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#14 Class 12 Physics Current Electricity 2025 Mcq 1M CBSE
Which of the following statements is not true for electric energy in ac form compared to that in dc form ?
A. Production of ac is economical
B. ac can be easily and efficiently converted from one voltage to the other
C. ac can be transmitted economically over long distances
D. ac is less dangerous. By = ($2 \times 10^{-7}$ T) sin (x + $1.5 \times 10^{11}$ t) (A) 6.0 fm (B) 30 fm (C) 72 fm (D) 150 fm
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#15 Class 12 Physics Current Electricity 2025 Short 3M CBSE
(a) ‘Current is a scalar quantity, although we represent current with an arrow.’ Explain. (b) Derive the balance condition of a Wheatstone Bridge.
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#16 Class 12 Physics Current Electricity 2025 Mcq 1M CBSE
A galvanometer of resistance G is converted into a voltmeter of range (0 − V) by connecting a resistor of 250 with it. If resistor of 250 is replaced by another resistor of 900 , its range becomes (0 − 3 V). The resis...
A. (R) (A),
B. ,
C. (A) (A) (R) (R), (A) (B) (A) (R) , (R), (A) (C) (A) , (R) (D) (A) (R)
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#17 Class 12 Physics Current Electricity 2025 Mcq 1M CBSE
The resistivity of a metal increases with rise in temperature because :
A. only relaxation time ‘’ of electrons decreases with temperature
B. only number of electrons per unit volume ‘n’ increases appreciably
C. ‘’ decreases with temperature but ‘n’ does not change appreciably
D. ‘’ decreases with temperature and ‘n’ increases
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#18 Class 12 Physics Current Electricity 2025 Short 3M CBSE
(a) The two Kirchhoff ’s rules are based on law of conservation of two physical quantities. Name the quantities. (b) Find magnitude and direction of current in 1 resistor in the given circuit.
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#19 Class 12 Physics Current Electricity 2025 Mcq 1M CBSE
Which of the following characteristics of electrons determines the current in the conductor ?
A. Drift velocity only
B. Thermal velocity only
C. Both drift velocity and thermal velocity
D. Neither drift nor thermal velocity
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#20 Class 12 Physics Current Electricity 2025 Mcq 1M CBSE
A wire is gradually stretched to make it 100% longer. Its resistance will increase by :
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