Moving Charges and Magnetism NEET PYQs (1996–2026)

Solved Moving Charges and Magnetism PYQs

3 recent questions with answers. The full set of 97 is free to practise.

1. NEET 2026MediumMagnetic Field (Wire/Loop/Solenoid)
   Q1

   Two infinitely long parallel conducting wires $A$ and $B$ carry currents $I$ and $2I$, respectively, in the same direction. The wire $A$ has uniform mass per unit length $\lambda$ and lies on an insulated floor. The wire $B$ is kept fixed at a height $h$ above the floor. The minimum magnitude of $h$ so that the wire $A$ does not rise from the floor is: [$g$ is the acceleration due to gravity and ${\mu }_0$ is the permeability of free space.]

   • A$\frac{{\mu }_0{I}^2}{2\pi \lambda g}$
   • B$\frac{2{\mu }_0{I}^2}{\pi \lambda g}$
   • C$\frac{{\mu }_0{I}^2}{\pi \lambda g}$
   • D$\frac{2{\mu }_0{I}^2}{3\pi \lambda g}$

   Show answer & solution

   Correct answer: (B)

   $$\frac{2{\mu }_0{I}^2}{\pi \lambda g}$$
2. NEET 2026HardMotion of Charged Particle in Uniform Magnetic Field
   Q2

   Which of the following statements are correct?
   
   A. Inside a conductor, the electrostatic field is zero.
   
   B. Electric field at the surface of a charged conductor does not depend on its surface charge density.
   
   C. The interior of a charged conductor can have no excess charge in the static situation.
   
   D. At the surface of a charged conductor, the electrostatic field must be normal to the surface at every point.
   
   E. The electrostatic potential is zero everywhere inside a charged conductor.
   
   Choose the correct answer from the options given below:

   • AA, B and D only
   • BA, C and E only
   • CA, C and D only
   • DC, D and E only

   Show answer & solution

   Correct answer: (C)

   A: True. B: False (field depends on $\sigma$). C: True. D: True. E:
   
   False (potential is constant but not necessarily zero). So A, C, D are
   
   correct.
3. NEET 2025HardMagnetic dipole
   Q3

   A model for quantized motion of an electron in a uniform magnetic field $B$ states that the flux passing through the orbit of the electron in $n$ (hle) where $n$ is an integer, $h$ is Planck's constant and $e$ is the magnitude of electron's charge. According to the model, the magnetic moment of an electron in its lowest energy state will be ( $m$ is the mass of the electron)

   • A$\frac{heB}{\pi m}$
   • B$\frac{heB}{2\pi m}$
   • C$\frac{he}{\pi m}$
   • D$\frac{he}{2\pi m}$

   Show answer & solution

   Correct answer: (D)

   The magnetic force acting on the electron is counterbalanced by the centripetal force necessary for its circular motion:
   
   $$evB=\frac{m{v}^2}{r}$$
   
   Solving for the velocity $v$ :
   
   $$v=\frac{eBr}{m}$$
   
   Flux through the Electron's Orbit:
   The model states that the magnetic flux $\varphi$ through the orbit is linked to Planck's constant $h$ as:
   
   $$B\pi r^2=\frac{nh}{e}$$
   
   Rearranging gives:
   
   $$B{r}^2=\frac{nh}{e\pi }$$
   
   Magnetic Moment:
   The magnetic moment $\mu$ is defined as the current $I$ times the area $A$ of the orbit:
   
   $$\mu =IA=\frac{e}{T}\pi r^2$$
   
   $$\mu =\frac{1}{2}e\left(\frac{eBr}{m}\right)r=\frac{1}{2}{e}^2\frac{B{r}^2}{m}$$
   
   Using the flux condition $B{r}^2=\frac{nh}{e\pi }$, we find:
   
   $$\mu =\frac{1}{2}{e}^2\frac{nh}{e\pi m}=\frac{neh}{2\pi m}$$
   
   Lowest Energy State:
   For the lowest energy state, take $n=1$ :
   
   $$\mu =\frac{eh}{2\pi m}$$
   
   Thus, the magnetic moment of an electron in its lowest energy state is $\frac{eh}{2\pi m}$.
   
   Considering current due to orbital motion:
   
   $$\mu =\frac{ev}{2\pi r}\times \pi r^2=\frac{evr}{2}$$
   
   Substitute for $v$ from the earlier velocity equation:

Topic-wise question count

Where NEET has asked from Moving Charges and Magnetism, most frequent first.

• Force on Moving Charge and Current Carrying Conductor23
• Magnetic Field due to Current Carrying Wire, Circular Loop and Solenoid22
• Motion of Charged Particle in Uniform Magnetic Field17
• Moving Coil Galvanometer13
• Magnetic Field (Wire/Loop/Solenoid)6
• Biot-Savart Law and Applications6
• Ampere’s Circuital Law and Applications5
• Magnetic dipole3
• Ampere’s Circuital Law1
• Torque on Current Loop in Magnetic Field1

Year-wise Moving Charges and Magnetism questions in NEET

Number of questions from this chapter in each year's paper(s).