Chapter 25 – Electromagnetic Waves

A parallel plate capacitor with plate area A and separation between the plates d, is charged by a constant current I .Consider a plane surface of area A/2 parallel to the plates and drawn between the plates. The displacement current through the area is A parallel plate capacitor with plate area A and separation between [...]

A circular ring of radius r is placed in a homogeneous magnetic field perpendicular to the plane of the ring. The field B changes with time according to the equation B=kt where K is constant and r is the time. The electric field in the ring is: The wave associated with 2.7 K belongs to [...]

A TV tower has a height of 100m. How much population is covered by TV broadcast. If the average population density around the tower is 1000 km^−2 ? (radius of earth = 6.4×10^6 m) A TV tower has a height of 100m. How much population is covered by TV broadcast. If the average population density [...]

A plane electromagnetic wave of intensity of 10W/m^2 strikes a small mirror of area 20cm^2, held perpendicular to the approaching wave. The radiation force on the mirror will be: A plane electromagnetic wave of intensity of 10W/m^2 strikes a small mirror of area 20cm^2 held perpendicular to the approaching wave. The radiation force on the [...]

The average energy-density of electromagnetic wave given by E=(50N/C)sin(ωt−kx) will be nearly: The average energy-density of electromagnetic wave given by E=(50N/C)sin(ωt−kx) will be nearly: June 4, 2021 Category: Cengage JEE Mains Physics by B.M Sharma , Chapter 25 - Electromagnetic Waves ,

A place electromagnetic wave Fs=100cos(6×10^8t+4x)V/m Propagates in a medium of dielectric constant. A place electromagnetic wave Fs=100cos(6×10^8t+4x)V/m Propagates in a medium of dielectric constant. June 4, 2021 Category: Cengage JEE Mains Physics by B.M Sharma , Chapter 25 - Electromagnetic Waves ,

Instantaneous displacement current of 1.0 A in the space between the parallel plates of 1μF capacitor can be established by changing potential difference of: Instantaneous displacement current of 1.0 A in the space between the parallel plates of 1μF capacitor can be established by changing potential difference of: June 4, 2021 Category: Cengage JEE Mains [...]

A plane electromagnetic wave of wave intensity 6W/m^2 strikes a small mirror of area 39 cm^2, held perpendicular to the approaching wave. The momentum transferred in kgms^−1 by the wave to the mirror each second will be A plane electromagnetic wave of wave intensity 6W/m^2 strikes a small mirror of area 39 cm^2 held perpendicular [...]

A parallel plate capacitor consists of two circular plates each of radius 12 cm and separated by 5.0 mm. The capacitor is being charge by an external source. The charging current is constant and is equal to 0.15 A. The rate of change of potential difference between the plate will be The wave associated with [...]

The sun delivers 10^3W/m^2 of electromagnetic flux to the earth’s surface. The total power that is incident on a roof of dimensions 8m×20m, will be The sun delivers 10^3W/m^2 of electromagnetic flux to the earth's surface. The total power that is incident on a roof of dimensions 8m×20m will be June 4, 2021 Category: Cengage [...]