Practice portal › JEE › Electromagnetic Waves

Momentum, Radiation Pressure and Force on a Charge for JEE: 22 solved questions

Real JEE paper questions on momentum, radiation pressure and force on a charge, part of electromagnetic waves. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 2004 to 2026. No sign-in needed to read them.

What this topic asks

• Force and radiation pressure — 9 questions
• Force on a charge inside the wave — 7 questions
• Momentum delivered: absorbed or reflected — 6 questions

All 22 questions with solutions

• Light is incident normally on a completely absorbing surface with an energy flux of 25 W cm⁻². If the surface… JEE Main 10th April 2nd Shift 2019
• A radiation of energy E falls normally on a perfectly reflecting surface. The momentum transferred to the sur… JEE Main 2004
• If the total energy transferred to a surface in time t is 6.48 × 10⁵ J, then the magnitude of the total momen… JEE Main 30th Jan 2nd Shift 2024
• A small object at rest, absorbs a light pulse of power 20 mW and duration 300 ns. Assuming speed of light as… JEE Main 30th Jan 1st Shift 2023
• 50 W/m² energy density of sunlight is normally incident on the surface of a solar panel. Some part of inciden… JEE Main 9th April 2nd Shift 2019
• The electric field in a plane electromagnetic wave is given by E⃗ = 200 cos[(0.5 × 10³/m)x - (1.5 × 10¹¹ rad/… JEE Main 26th Aug 1st Shift 2021
• The radiation pressure exerted by a 450 W light source on a perfectly reflecting surface placed at 2 m away f… JEE Main 3rd April 1st Shift 2025
• If 2.5 × 10⁻⁶ N average force is exerted by a light wave on a non-reflecting surface of 30 cm² area during 40… JEE Main 17th March 1st Shift 2021
• Average force exerted on a non-reflecting surface at normal incidence is 2.4 × 10⁻⁴ N. If 360 W/cm² is the li… JEE Main 8th April 1st Shift 2024
• Sunlight falls normally on a surface of area 36 cm² and exerts an average force of 7.2 × 10⁻⁹ N within a time… JEE Main 28th July 2nd Shift 2022
• A small mirror of mass m is suspended by a massless thread of length l. Then the small angle through which th… JEE Main 4th April 1st Shift 2025
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Ass… JEE Main 29th Jan 1st Shift 2025
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Ass… JEE Main 5th April 2nd Shift 2026
• An object is placed in a medium of refractive index 3. An electromagnetic wave of intensity 6 × 10⁸ W/m² fall… JEE Main 27th Jan 2nd Shift 2024
• A point source of light is placed at the centre of curvature of a hemispherical surface. The source emits a p… JEE Main 30th Jan 1st Shift 2023
• An electromagnetic wave travelling in x-direction is described by field equation E_y = 300 sin(ω(t - x/c)). I… JEE Main 2nd April 1st Shift 2026
• A beam of light travelling along X-axis is described by the electric field E_y = 900 sin(ω(t - x/c)). The rat… JEE Main 27th July 1st Shift 2022
• A light beam is described by E = 800 sin(ω(t - x/c)). An electron is allowed to move normal to the propagatio… JEE Main 26th Aug 2nd Shift 2021
• An electron is constructed to move along the y-axis with a speed of 0.1 c (c is the speed of light) in the pr… JEE Main 5th Sept 1st Shift 2020
• The magnetic field of a plane electromagnetic wave is given by B⃗ = B₀ ı̂ [cos(kz - ω t)] + B₁ ȷ̂ cos(kz + ω… JEE Main 9th April 1st Shift 2019
• The electric field of a plane electromagnetic wave is given by E⃗ = E₀ (ı̂ + ȷ̂)/(√2) cos(kz + ω t). At t = 0… JEE Main 7th Jan 2nd Shift 2020
• The electric fields of two plane electromagnetic plane waves in vacuum are given by E⃗₁ = E₀ ȷ̂ cos(ω t - kx)… JEE Main 9th Jan 1st Shift 2020