List of top Physics Questions on Moving charges and magnetism asked in JEE Main

Two charged particles, having same kinetic energy, are allowed to pass through a uniform magnetic field perpendicular to the direction of motion If the ratio of radii of their circular paths is $6: 5$ and their respective masses ratio is $9: 4$ Then, the ratio of their charges will be :

In a moving coil galvanometer if the number of turns increases by 25%, then change in voltage sensitivity is?

A charge particle of $2 \,\mu C$ accelerated by a potential difference of $100\, V$ enters a region of uniform magnetic field of magnitude $4 \,mT$ at right angle to the direction of field The charge particle completes semicircle of radius $3 \,cm$ inside magnetic field The mass of the charge particle is _______ $\times 10^{-18} kg$

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 turns and the same current produces a magnetic induction $B _2$ at its centre The ratio of $\frac{ B _2}{ B _1}$ is :

An electron is moving along positive x direction in xy plane, magnetic field points in negative z direction, then the force due to magnetic field on electron points in the direction

A solenoid of $1200$ tums is wound uniformly in a single layer on a glass tube $2\, m$ long and $02\, m$ in diameter The magnetic intensity at the center of the solenoid when a current of $2 A$ flows through it is:

For a moving coil galvanometer, the deflection in the coil is $005$ rad when a current of $10 \,mA$ is field is $0,01 \,T$ and the number of turns in the coil is $200$ , the area of each tum (in $cm ^2$ ) is :

A long solenoid is formed by winding $70$ turns $cm ^{-1}$ If $20$ A current flows, then the magnetic field produced inside the solenoid is ______$\left(\mu_o=4 \pi \times 10^{-7} TmA ^{-1}\right)$

Two identical current carrying coils with same centre are placed with their planes perpendicular to each other. If i = $\sqrt{2}A$ and radius of coil R = 1 m, then magnetic field at centre C is equal to:

A dipole having dipole moment M is placed in two magnetic fields of strength B1 and B2 respectively. The dipole oscillates 60 times in 20 seconds in the $B_1$ magnetic field and 60 oscillations in 30 seconds in the $B_2$ magnetic field. Then find the $\frac{B_1}{B_2}$

An electron with energy $01\, keV$ moves at right angle to the earth's magnetic field of $1 \times 10^{-4} Wbm ^{-2}$ The frequency of revolution of the electron will be (Take mass of electron $=90 \times 10^{-31} kg$ )

The characteristics of two coil is given below. If the magnetic moment of both coil A and B are equal then choose the correct relation,

Coil A	Coil B
Radius r_A=10 cm	r_B=20 cm
Number of turns N_A	N_B
Current I_A	I_B

Two long straight wires $P$ and $Q$ carrying equal current $10\, A$ each were kept parallel to each other at $5 \, cm$ distance Magnitude of magnetic force experienced by $10 \, cm$ length of wire $P$ is $F_1$ If distance between wires is halved and currents on them are doubled, force $F_2$ on $10 \, cm$ length of wire $P$ will be:

The magnetic moments associated with two closely wound circular coils $A$ and $B$ of radius $r _{ A }=10$ $cm$ and $r _B=20 cm$ respectively are equal if : (Where $N _A, I _A$ and $N _B, I _{ B }$ are number of turn and current of $A$ and $B$ respectively)

Two long parallel wires carrying currents $8 A$ and $15 A$ in opposite directions are placed at a distance of $7 cm$ from each other A point $P$ is at equidistant from both the wires such that the lines joining the point $P$ to the wires are perpendicular to each other The magnitude of magnetic field at $P$ is___$\times 10^{-6} T$(Given : $\sqrt{2}=1.4$ )

A metallic cube of side 15 cm moving along y-axis at a uniform velocity of 2 ms–1. In a region of uniform magnetic field of magnitude 0.5T directed along z-axis. In equilibrium the potential difference between the faces of higher and lower potential developed because of the motion through the field will be ___ mV.

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 field is

A singly ionized magnesium atom (A=24) ion is accelerated to kinetic energy 5keV and is projected perpendicularly into a magnetic field B of the magnitude 0.5 T. The radius of path formed will be ________ cm.

Given below are two statements:

Statement I: The electric force changes the speed of the charged particle and hence changes its kinetic energy; whereas the magnetic force does not change the kinetic energy of the charged particle.
Statement II: The electric force accelerates the positively charged particle perpendicular to the direction of electric field. The magnetic force accelerates the moving charged particle along the direction of magnetic field.

In the light of the above statements, choose the most appropriate answer from the options given below:

Two 10 cm long, straight wires, each carrying a current of 5 A are kept parallel to each other. If each wire experienced a force of 10^–5 N, then separation between the wires is _____ cm.

A cyclotron is used to accelerate protons.If the operating magnetic field is 1.0 T and the radius of the cyclotron ‘dees’ is 60 cm,the kinetic energy of the accelerated protons in MeV will be
$[Use\ m_p = 1.6×10^{-27}\ kg, e = 1.6×10^{-19}C]$

A charge particle is moving in a uniform field $(2\hat i+3\hat j)T$. If it has an acceleration of $(α\hat i−4\hat j)\ m/s^2$, then the value of α will be

A bar magnetic having a magnetic moment of 2.0 × 10⁵ JT^–1, is placed along the direction of uniform magnetic field of magnitude B = 14 × 10^–5 T. The work done in rotating the magnet slowly through 60° from the direction of field is:

Two long current carrying conductors are placed parallel to each other at a distance of 8 cm between them. The magnitude of magnetic field produced at mid-point between the two conductors due to current flowing in them is 30 μT. The equal current flowing in the two conductors is:

List of top Physics Questions on Moving charges and magnetism asked in JEE Main

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