1

JEE Main 2021 (Online) 17th March Evening Shift

Numerical

+4

-1

The electric field intensity produced by the radiation coming from a 100 W bulb at a distance of 3 m is E. The electric field intensity produced by the radiation coming from 60W at the same distance is $$\sqrt {{x \over 5}} $$E. Where the value of x = ____________.

Your input ____

2

JEE Main 2021 (Online) 17th March Evening Shift

Numerical

+4

-1

Seawater at a frequency f = 9 $$\times$$ 10

^{2}Hz, has permittivity $$\varepsilon $$ = 80$$\varepsilon $$_{0}and resistivity $$\rho$$ = 0.25 $$\Omega$$m. Imagine a parallel plate capacitor is immersed in seawater and is driven by an alternating voltage source V(t) = V_{0}sin(2$$\pi$$ft). Then the conduction current density becomes 10^{x}times the displacement current density after time t = $${1 \over {800}}$$s. The value of x is _____________. (Given : $${1 \over {4\pi {\varepsilon _0}}} = 9 \times {10^9}$$ Nm^{2}C^{$$-$$2})Your input ____

3

JEE Main 2021 (Online) 17th March Morning Shift

Numerical

+4

-1

If 2.5 $$\times$$ 10

(Assume complete absorption and normal incidence conditions are there)

^{$$-$$6}N average force is exerted by a light wave on a non-reflecting surface of 30 cm^{2}area during 40 minutes of time span, the energy flux of light just before it falls on the surface is ___________ W/cm^{2}. (Round off to the Nearest Integer)(Assume complete absorption and normal incidence conditions are there)

Your input ____

4

JEE Main 2021 (Online) 26th February Morning Shift

Numerical

+4

-1

A radiation is emitted by 1000W bulb and it generates an electric field and magnetic field at P, placed at a distance of 2m. The efficiency of the bulb is 1.25%. The value of peak electric field at P is x $$\times$$ 10

^{$$-$$1}V/m. Value of x is ___________. (Rounded off to the nearest integer) [Take $${\varepsilon _0} = 8.85 \times {10^{ - 12}}$$ C^{2}N^{$$-$$1}m^{$$-$$2}, c = $$3 \times {10^8}$$ ms^{$$-$$1}]Your input ____

Questions Asked from Electromagnetic Waves (Numerical)

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