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#1 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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#2 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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#3 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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#4 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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#5 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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#6 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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#7 Class 12 Physics Moving Charges and Magnetism 2022 Short 3M CBSE
Find the magnetic field at the centre of the coil shown in the figure. (Composite loop with straight and curved sections — refer to figure in document)
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#8 Class 12 Physics Moving Charges and Magnetism 2021 Short 3M CBSE
A straight wire carrying 12 A is bent into a semicircular arc of radius 2 cm. (a) Find the direction and magnitude of magnetic field at the centre of the arc. (b) Would your answer change if the wire were bent in the ...
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#9 Class 12 Physics Moving Charges and Magnetism 2020 Short 2M CBSE
Two similar coils of radius $R$ are lying concentrically with their planes at right angles to each other. Currents $I$ and $2I$ flow through them respectively. Find the resultant magnetic field induction at the centre.
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#10 Class 12 Physics Moving Charges and Magnetism 2019 Short 2M CBSE
A long wire carrying a steady current is bent into a circular loop of 1 turn. The magnetic field at the centre is $B$. It is then bent into a circular coil of $n$ turns. What will be the magnetic field at the centre o...
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#11 Class 12 Physics Moving Charges and Magnetism 2020 Short 3M CBSE
Calculate the magnetic field due to a circular coil of 500 turns and diameter 0.1 m, carrying a current of 7 A: (A) At a point on the axis at distance 0.12 m from centre (B) At the centre of the coil. ($\mu_0 = 4\pi \...
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#12 Class 12 Physics Moving Charges and Magnetism 2021 Short 2M CBSE
Two very long straight insulated wires are kept at 90° to each other in the xy-plane. Both wires carry equal magnitude of current $I$ in directions shown in the figure. What is the net magnetic field at the origin?
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#13 Class 12 Physics Moving Charges and Magnetism 2023 Short 3M CBSE
Find the magnitude of the magnetic field at the centre of an equilateral triangular loop of side 1 m carrying a current of 10 A. ($\mu_0 = 4\pi \times 10^{-7}$ N A$^{-2}$)
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#14 Class 12 Physics Moving Charges and Magnetism 2022 Short 5M CBSE
Use Biot-Savart law to obtain an expression for the magnetic field at the centre of a coil bent in the form of a square of side $2a$ carrying current $I$.
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#15 Class 12 Physics Moving Charges and Magnetism 2021 Short 3M CBSE
From the figure shown, find the magnetic field at point P if $i = 10$ A, $a = 70$ cm, $\phi_1 = 37°$ and $\phi_2 = 53°$.
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#16 Class 12 Physics Moving Charges and Magnetism 2018 Short 1M CBSE
Write the expression for Biot-Savart's law.
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#17 Class 12 Physics Moving Charges and Magnetism 2020 Short 2M CBSE
Write an expression for the maximum kinetic energy acquired by charged particles accelerated by a cyclotron.
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#18 Class 12 Physics Moving Charges and Magnetism 2019 Short 2M CBSE
A magnetic field that varies in magnitude from point to point but has a constant direction (east to west) is set up in a chamber. A charged particle enters the chamber and travels undeflected along a straight path wit...
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#19 Class 12 Physics Moving Charges and Magnetism 2021 Short 2M CBSE
Two particles A and B of masses $m$ and $2m$ have charges $q$ and $2q$ respectively. They move with velocities $v_1$ and $v_2$ in the same direction in the same magnetic field $B$ acting normally. If the forces $F_A$ ...
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#20 Class 12 Physics Moving Charges and Magnetism 2022 Short 5M CBSE
A long straight wire of circular cross-section of radius $a$ carries steady current $I$ uniformly distributed across its cross-section. Using Ampere's law, calculate the magnetic field for: (a) $r <a> a$ (outside).
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