Medicneet Logo
NEET 2025 · PhysicsAmpere-Maxwell lawPrevious Year Question

A parallel plate capacitor made of circular plates is being charged such that the surface charge density on its plates is increasing at a constant rate with time. The magnetic field arising due to the displacement current is

Answer: (A) Non-zero everywhere with maximum at the imaginary cylindrical surface connecting the peripheries of the plates. Answer: (A) Non-zero everywhere with maximum at the imaginary cylindrical surface connecting the peripheries of the plates.

  1. A.Non-zero everywhere with maximum at the imaginary cylindrical surface connecting the peripheries of the plates✓
  2. B.Zero between the plates and non-zero outside
  3. C.Zero at all places
  4. D.Constant between the plates and zero outside the plates

Correct Answer

(A) Non-zero everywhere with maximum at the imaginary cylindrical surface connecting the peripheries of the plates

Solution & Explanation

Answer: (A) Non-zero everywhere with maximum at the imaginary cylindrical surface connecting the peripheries of the plates. The displacement current produces a magnetic field that circles the axis. Inside (r < R), B ∝ r (grows with radius); outside (r > R), B ∝ 1/r (falls off). Hence B is maximum at the edge r = R (the cylindrical surface joining the plate rims) and non-zero both inside and outside.

🎯
43,000+ questions in हिंदी & English · one-tap toggle
Practice NEET 2025 Physics — free, with instant solutions
43,000+ NEET questions solved step-by-step, chapter-wise, in the MedicNEET app.
📚Practice all NEET Physics PYQs chapter-wise →💡Don't get it? Learn the Electromagnetic Waves concepts →
← Physics Q37Physics Q39 →

More NEET PYQ solutions

PhysAn electric dipole with dipole moment 5 × 10⁻⁶ C·m is aligned with the direction of a uniform electric field of magnitude 4 × 10⁵ N/C. The dipole is then rotated through an angle of 60° with respect to the electric field. The change in the potential energy of the dipole is:PhysTwo identical charged conducting spheres A and B have their centres separated by a certain distance. Charge on each sphere is q and the force of repulsion between them is F. A third identical uncharged conducting sphere is brought in contact with sphere A first and then with B and finally removed from both. New force of repulsion between spheres A and B (radii negligible vs separation, treated as point charges) is best given as:PhysThe plates of a parallel plate capacitor are separated by d. Two slabs of different dielectric constant K1 and K2 with thickness 3d/8 and d/2 respectively are inserted in the capacitor. Due to this, the capacitance becomes two times larger than when there is nothing between the plates. If K1/K2 = 1.25, the value of K1 is:PhysA sphere of radius R is carved out of a uniform solid sphere of radius 2R (internally tangent, so its centre is at distance R from the big centre). The ratio of the moment of inertia of the small sphere to that of the remaining part, both about the Y-axis through the big sphere's centre, is:PhysThe Sun rotates once in 27 days. If it expanded to twice its present radius (uniform-density sphere, no external influence), its new period would be about:PhysA uniform rod of mass 20 kg and length 5 m leans against a smooth vertical wall, making 60° with the wall; its lower end rests on a rough horizontal floor. The friction force exerted by the floor is: (g = 10 m/s²)PhysA bob of mass m is suspended by a light string of length l and given a horizontal velocity v₀ at the lowest point. The string goes slack at a point P where it makes an angle θ above the horizontal. The ratio of the speed v at P to the initial speed v₀ is:PhysA ball of mass 0.5 kg is dropped from a height of 40 m. It hits the ground and rebounds to a height of 10 m. The impulse imparted to the ball during its collision with the ground is (g = 9.8 m/s²):
More: All NEET 2025 Physics PYQs · NEET Physics PYQs · All NEET PYQs · Previous year papers