Moving Charges & Magnetism: JEE Main Physics Previous Year Questions

549 previous year questions from Moving Charges & Magnetism. Here are the 25 most important ones; open any question for the correct answer and a full step-by-step solution.

1. 1.A galvanometer of resistance $50\Omega$ gives a full scale deflection for a current $5\times {10}^{-4}A$. The resistance that should be connected in series with…
2. 2.A long solenoid has 200 turns per $\text{cm}$ and carriers a current $i$. The magnetic field at its centre is $6.28\times {10}^{-2}\text{Wb}/m^2$. Another l…
3. 3.A long cylindrical wire of radius $R$ carries a uniform current $I$ flowing through it. The variation of magnetic field with distance $r$ from the axis of the wire is…
4. 4.The electric current in a circular coil of 2 turns produces a magnetic induction $B_1$ at its center. The coil is unwound and is rewound into a circular coil of 5 turns…
5. 5.A proton, an electron, and a Helium nucleus, have the same energy. They are in circular orbits in a plane due to magnetic field perpendicular to the plane. Let…
6. 6.A closely wound solenoid of $80\text{cm}$ long has 5 layers of windings of 400 turns each. The diameter of the solenoid is $1.8\text{cm}$. If the current carried is…
7. 7.A tightly wound 100 turns coil of radius 10 cm carries a current of 7 A. The magnitude of the magnetic field at the center of the coil is (Take, permeability of free spac…
8. 8.A current carrying solenoid is placed vertically and a particle of mass m with charge Q is released from rest. The particle moves along the axis of solenoid. If g is acce…
9. 9.A voltmeter of $250\text{mV}$ range having a resistance of $10\Omega$ is converted into an ammeter of $250\text{mA}$ range. The value of necessary shunt is (nearly)
10. 10.A beam of electrons is moving with constant velocity in a region having electric and magnetic fields of strength $20V{m}^{-1}$ and $0.5T$ at right angles to the directi…
11. 11.$10A$ current is flowing in two straight parallel wires in the same direction. Force of attraction between them is $1\times {10}^{-3}N$. If the current is…
12. 12.A long current carrying wire produces a magnetic field of $1T$ at a distance of $r$. The magnetic field (i) $\frac{r}{2}$ (ii) $2r$ and (ii) $3r$ is
13. 13.A circular coil carrying a certain current produces a magnetic field $B_0$ at its centre. The coil is now rewound so as to have 3 turns and the same current is passe…
14. 14.A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected in the region such that its vel…
15. 15.A long straight wire of circular cross-section (radius a) is carrying steady current I. The current I is uniformly distributed across this cross-section. The magnetic fie…
16. 16.A beam of protons with speed $4\times {10}^5{\text{ms}}^{-1}$ enters a uniform magnetic field of $0.3T$ at an angle of ${60}^{\circ }$ to the magnetic field. The pit…
17. 17.A magnetic field of $5\times {10}^{-5}T$ is produced at a perpendicular distance of $0.2m$ from a long straight wire carrying electric current. If the permeability of f…
18. 18.Astraightwireofdiameter0.5mmcarrying a current of 1 A is replaced by the another wire of 1 mm diameter carrying the same current. The strength of the magnetic field far a…
19. 19.If an optical medium possesses a relative permeability of $\frac{10}{\pi }$ and relative permittivity of $\frac{1}{0.0885}$, then the velocity of light is greater in va…
20. 20.A circular loop of radius r is carrying current I A. The ratio of magnetic field at the center of circular loop and at a distance r from the center of the loop on its axi…
21. 21.Ionized hydrogen atoms and $\alpha$ ‐particles with same momenta enters perpendicular to a constant magnetic field, $B$. The ratio of their radii of their paths…
22. 22.A charged particle carrying charge $1\text{μC}$ is moving with velocity $\text{(}2i+3j+4k\text{)}m{s}^{-1}$. If an external magnetic field of…
23. 23.The electric current in a circular coil of 2 turns produces a magnetic induction $B_1$ at its centre. The coil is unwound and is rewound into a circular coil of 5 tu…
24. 24.For parallel conductors and steady currents, the results in accordance with Newton's third law are
25. 25.The magnetic field at the center of a current carrying loop of radius $0.1m$ is $5\sqrt{5}$ times that at a point along its axis. The distance of this point from…