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JEE • PHYSICS • ELECTROMAGNETIC WAVES

Electromagnetic waves practice · Hard

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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1 Hard

1 of 6

Understanding +4 | -1

The velocity of electromagnetic wave in good conductor is

View answer and explanation

Correct option: C

Very low

Option C (Very low) is correct because good conductors attenuate electromagnetic waves significantly, resulting in a very low velocity.

2 Hard

2 of 6

Application +4 | -1

A parallel plate condenser of capacity 100 PF is connected to 230 V of AC supply of 300 rad / sec frequency. The rms value of displacement current [in

\mu A

]

View answer and explanation

Correct option: A

6.9

Option A (6.9) is correct because the RMS value of displacement current is calculated using the formula

I_d = VC\omega

3 Hard

3 of 6

Application +4 | -1

Assume that all the energy from a

1000 \mathrm{~W}

lamp is radiated uniformly, then the amplitude of electric field of radiation at a distance of

2 \mathrm{~m}

from the lamp is

View answer and explanation

Correct option: A

245.01 \mathrm{~V} / \mathrm{m}

Option A (

245.01 \mathrm{~V} / \mathrm{m}

) is correct because it is the amplitude of the electric field calculated from the power of the lamp and the distance, considering uniform radiation.

4 Hard

4 of 6

Application +4 | -1

A parallel plate capacitor of plate separation 2 mm is connected in on electric circuit having source voltage 400 volts. It the plate area is

60\,c{m^2}

, then the value of displacement current for

{10^{ - 6}}

sec. will be

View answer and explanation

Correct option: B

1.062 \times {10^{ - 2}}\mathrm{ amp}

Option B (

1.062 \times {10^{ - 2}}\mathrm{ amp}

) is correct because it is the value of displacement current calculated using the formula

{I_D} = { \in _\mathrm{o}}\frac{{\partial {\phi _E}}}{{\partial t}}

5 Hard

5 of 6

Remembering +4 | -1

Electromagnetic energy is radiated by:

(a) Stationary charge

(b) A charge in uniform motion

(c) An accelerated charge only

(d) An accelerated charge and a charge in uniform motion

Choose the correct statement.

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Correct option: C

Option C ((c) only) is correct because only an accelerated charge radiates electromagnetic energy.

6 Hard

6 of 6

Understanding +4 | -1

The condition under which a microwave oven heats up a food item containing water molecules most efficiently in

View answer and explanation

Correct option: A

the frequency of the microwave must match the resonant frequency of the water molecules

Option A is correct because microwave ovens heat food by exciting water molecules, and this is most efficient when the microwave frequency matches the resonant frequency of the water molecules.

Revision notes and key takeaways

Review ELECTROMAGNETIC WAVES in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 6 single-correct-answer MCQs on ELECTROMAGNETIC WAVES.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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