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#1 Class 12 Physics Magnetism and Matter 2021 Mcq 1M CBSE
If a bar magnet is dropped into an infinitely long vertical copper tube, the magnet will
A. move with increasing velocity and acceleration
B. move with increasing velocity but constant acceleration
C. decelerate and come to rest
D. accelerate and ultimately acquire a constant terminal velocity
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#2 Class 12 Physics Magnetism and Matter 2020 Mcq 1M CBSE
Which of the following is an example of a diamagnetic substance?
A. copper
B. nickel
C. aluminium
D. iron
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#3 Class 12 Physics Magnetism and Matter 2019 Mcq 1M CBSE
The magnetic field at a distance $r$ from a short bar magnet is directly proportional to
A. $r^2$
B. $r^{-3}$
C. $r^{2/3}$
D. $r^4$
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#4 Class 12 Physics Magnetism and Matter 2018 Mcq 1M CBSE
If a material placed in a magnetic field is thrown out of it, then the material is
A. diamagnetic
B. paramagnetic
C. ferromagnetic
D. non-magnetic
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#5 Class 12 Physics Magnetism and Matter 2020 Mcq 1M CBSE
When the intensity of the magnetic field is increased four times, the time period of a suspended magnetic needle becomes
A. double
B. half
C. four times
D. one-fourth
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#6 Class 12 Physics Magnetism and Matter 2019 Short 1M CBSE
What is the SI unit of magnetic moment?
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#7 Class 12 Physics Magnetism and Matter 2017 Mcq 1M CBSE
The SI unit of pole strength is
A. N
B. N/A-m
C. A-m
D. T
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#8 Class 12 Physics Magnetism and Matter 2018 Mcq 1M CBSE
The relative permeability $\mu_r$ of a ferromagnetic substance is
A. $\mu_r \gg 1$
B. $\mu_r = 1$
C. $\mu_r < 1$
D. $\mu_r = 0$
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#9 Class 12 Physics Magnetism and Matter 2020 Short 2M CBSE
A wire of magnetic dipole moment $M$ and length $L$ is bent into the shape of a semicircle of radius $r$. What will be its new magnetic dipole moment?
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#10 Class 12 Physics Magnetism and Matter 2016 Mcq 1M CBSE
Magnetic dipole moment is a vector quantity directed from
A. South to North Pole
B. North to South Pole
C. East to West direction
D. West to East direction
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#11 Class 12 Physics Magnetism and Matter 2019 Mcq 1M CBSE
A bar magnet of magnetic moment $M$ is cut into two equal parts longitudinally. The magnetic moment of either part is
A. $M$
B. $M/2$
C. $2M$
D. Zero
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#12 Class 12 Physics Moving Charges and Magnetism 2022 Short 3M CBSE
A rectangular coil of area $5.0 \times 10^{-4}$ m$^2$ and 60 turns is pivoted about one of its vertical sides in a radial horizontal magnetic field of 90 G. If a current of 0.20 mA produces an angular deflection of 18...
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#13 Class 12 Physics Moving Charges and Magnetism 2021 Short 3M CBSE
What is the significance of the restoring torque in the moving coil galvanometer? Write down the equation for the restoring torque and explain the variables.
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#14 Class 12 Physics Moving Charges and Magnetism 2020 Short 2M CBSE
A planar loop of irregular shape encloses an area of $7.5 \times 10^{-4}$ m$^2$ and carries a current of 12 A. The sense of current appears clockwise to an observer. Find the magnitude and direction of the magnetic mo...
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#15 Class 12 Physics Moving Charges and Magnetism 2019 Short 2M CBSE
A horizontal wire 0.1 m long carries a current of 5 A. Find the magnitude and direction of the magnetic field which can support the weight of the wire. (Mass per unit length $= 3 \times 10^{-3}$ kg/m, $g = 10$ m/s$^2$)
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#16 Class 12 Physics Moving Charges and Magnetism 2020 Short 2M CBSE
A long straight wire carries a current of 2 A. An electron travels with velocity $4 \times 10^4$ m/s parallel to the wire at a distance of 0.1 m, in a direction opposite to the current. What force does the magnetic fi...
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#17 Class 12 Physics Moving Charges and Magnetism 2021 Short 2M CBSE
The magnetic force acting on a charged particle of charge $-2\ \mu$C in a magnetic field of 2 T acting in y-direction, when the particle velocity is $(2\hat{i} + 3\hat{j}) \times 10^6$ m/s, is
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#18 Class 12 Physics Moving Charges and Magnetism 2022 Short 3M CBSE
A solenoid is 2.0 m long and 8.0 cm in diameter. It has 5 layers of winding of 1000 turns each and carries a current of 5.0 A. What is the magnetic field at its centre? ($\mu_0 = 4\pi \times 10^{-7}$ T·m/A)
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#19 Class 12 Physics Moving Charges and Magnetism 2023 Short 5M CBSE
Derive the expression for the magnetic field due to a long solenoid.
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#20 Class 12 Physics Moving Charges and Magnetism 2020 Short 2M CBSE
A long straight solid conductor of radius 5 cm carries a current of 2 A uniformly distributed over its circular cross-section. Find the magnetic field induction at a distance of 3 cm from the axis of the conductor.
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