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#1 Class 12 Physics Magnetism and Matter 2025 Long 1M CBSE
Assertion (A) : When a ferromagnetic substance is heated to high temperature it becomes paramagnetic in nature. Reason (R) : The disappearance of magnetisation of a ferromagnet is abrupt and not gradual.
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#2 Class 12 Physics Magnetism and Matter 2025 Mcq 1M CBSE
An electric current can be induced in a wire loop if –
A. the wire loop is wound around a bar magnet
B. a bar magnet is placed in contact with the wire loop
C. a bar magnet is placed near the wire loop
D. a bar magnet is moved rapidly towards the wire loop
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#3 Class 12 Physics Magnetism and Matter 2025 Mcq 1M CBSE
Which one of the following materials has magnetic susceptibility in the range –1 < < 0 ?
A. Aluminium
B. Copper chloride
C. Copper
D. Nickel
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#4 Class 12 Physics Magnetism and Matter 2025 Mcq 1M CBSE
Which of the following substance has relative magnetic permeability
A. Aluminium
B. Copper
C. Lead
D. Nickel
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#5 Class 12 Physics Magnetism and Matter 2025 Mcq 1M CBSE
Which of the following materials has positive and small value of magnetic susceptibility ?
A. Cu
B. Al
C. Bi
D. Ni
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#6 Class 12 Physics Moving Charges and Magnetism 2025 Short 3M CBSE
What is meant by displacement current ? A capacitor is being charged by a battery. Show that Ampere-Maxwell law justifies continuity and constancy of the current flowing in the circuit.
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#7 Class 12 Physics Moving Charges and Magnetism 2025 Mcq 1M CBSE
A charged particle is moving in a uniform magnetic field B with a constant speed v in a circular path of radius r. Which of the following graphs represents the variation of radius of the circle, with the magnitude of ...
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#8 Class 12 Physics Moving Charges and Magnetism 2025 Short 5M CBSE
(i) A rectangular loop of sides a and b carrying current I is placed in a magnetic field B such that its area vector A makes an angle with B . With the help of a suitable diagram, show that the torque acting on the lo...
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#9 Class 12 Physics Moving Charges and Magnetism 2025 Short 3M CBSE
A long solenoid of length L and radius r$_{1}$ having N$_{1}$ turns is surrounded symmetrically by a coil of radius r$_{2}$ (> r$_{1}$) having N$_{2}$ turns (N$_{2}$ << N$_{1}$) around its mid-point. Derive an express...
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#10 Class 12 Physics Moving Charges and Magnetism 2025 Short 3M CBSE
Write the expression for the magnetic field due to a current element in vector form. Consider a 1 cm segment of a wire, centered at the origin, carrying a current of 10 A in positive x-direction. Calculate the magneti...
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#11 Class 12 Physics Moving Charges and Magnetism 2025 Mcq 1M CBSE
Four long straight thin wires are held vertically at the corners A, B, C and D of a square of side ‘a’, kept on a table and carry equal current ‘I’. The wire at A carries current in upward direction whereas the curren...
A. and directed along OC
B. and directed along OD
C. and directed along OB
D. and directed along OA
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#12 Class 12 Physics Moving Charges and Magnetism 2025 Mcq 1M CBSE
A coil having 100 closely wound turns and area of cross-section 300 $mm^2$ carries a current of 5 mA. The magnitude of the magnetic moment associated with the coil is :
A. 6 10− 4 Am2
B. 3 10− 5 Am2
C. 1.5 10− 4 Am2
D. 5 10− 5 Am2
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#13 Class 12 Physics Moving Charges and Magnetism 2025 Mcq 1M CBSE
A closely wound long solenoid of self-inductance L is cut into two identical solenoids. The value of self-inductance of each small solenoid will be :
A. 2L
B. 3L
C. 4L
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#14 Class 12 Physics Moving Charges and Magnetism 2025 Mcq 1M CBSE
Two particles of masses m$_{1}$ and $m^2$ having charges q$_{1}$ and q$_{2}$ respectively are projected with the same velocity in a region of uniform magnetic field B pointing vertically upward. If they describe circu...
A. 6 10− 4 Am2
B. 3 10− 5 Am2
C. 1.5 10− 4 Am2
D. 5 10− 5 Am2
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#15 Class 12 Physics Moving Charges and Magnetism 2025 Long 1M CBSE
Assertion (A) : The cylindrical soft iron core in a moving coil galvanometer only makes the magnetic field radial and does not affect the strength of the magnetic field. Reason (R) : In a moving coil galvanometer, the...
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#16 Class 12 Physics Moving Charges and Magnetism 2025 Long 4M CBSE
A charged particle is moving horizontally with a velocity v . If a uniform magnetic field B directly vertically up is set-up in the region, the particle moves in a circle of radius R in anti- clockwise direction. 41=4...
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#17 Class 12 Physics Moving Charges and Magnetism 2025 Short 3M CBSE
(a) Briefly explain how Lenz’s law is consistent with the law of conservation of energy. (b) Considering the case of the magnetic field B inside a solenoid of length l, area of cross-section A, prove that magnetic ene...
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#18 Class 12 Physics Moving Charges and Magnetism 2025 Short 3M CBSE
(a) A straight vertical wire carries a current of 3 A upward along +z axis. Calculate the magnitude and direction of the magnetic field at a point 15 cm away from the wire on +x-axis. Name the rule used to find the di...
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#19 Class 12 Physics Moving Charges and Magnetism 2025 Mcq 1M CBSE
A person is standing facing geographic north and a vertical wire in front of him is carrying a current in downward direction. The direction of magnetic field at a point on the right side of wire is
A. South
B. East
C. West
D. North
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#20 Class 12 Physics Moving Charges and Magnetism 2025 Mcq 1M CBSE
A straight conductor lies along x-axis and carries a current of 2 A along +x direction. The magnetic field at a point (0, 40 cm, 0) due to 1 cm length of conductor centered at the origin points along.
A. y-axis
B. –y-axis
C. z-axis
D. –z-axis
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