Chapter 17: Problem 4
The electromagnetic waves do not transport (A) Energy (B) Charge (C) Momentum (D) Information
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Chapter 17: Problem 4
The electromagnetic waves do not transport (A) Energy (B) Charge (C) Momentum (D) Information
These are the key concepts you need to understand to accurately answer the question.
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A lamp emits monochromatic green light uniformly in all directions. The lamp is \(3 \%\) efficient in converting electrical power to electromagnetic waves and consumes \(100 \mathrm{~W}\) of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of \(10 \mathrm{~m}\) from the lamp will be (A) \(1.34 \mathrm{~V} / \mathrm{m}\) (B) \(2.68 \mathrm{~V} / \mathrm{m}\) (C) \(5.36 \mathrm{~V} / \mathrm{m}\) (D) \(9.37 \mathrm{~V} / \mathrm{m}\)
The frequency from 3 to \(\mathrm{MHz}\) is known as (A) Audio band (B) Medium frequency band (C) Very high frequency band (D) High frequency band
A \(100 \mathrm{pF}\) capacitor is connected to a \(230 \mathrm{~V}, 50 \mathrm{~Hz} \mathrm{AC}\) source. The rms value of conduction current will be (A) \(7.2 \times 10^{-6} \mathrm{~A}\) (B) \(3.6 \times 10^{-5} \mathrm{~A}\) (C) \(1.8 \times 10^{-4} \mathrm{~A}\) (D) \(0.9 \times 10^{-3} \mathrm{~A}\)
If \(E\) and \(B\) are the electric and magnetic field vectors of electromagnetic waves then the direction of propagation of electromagnetic wave is along the direction of (A) \(\vec{E}\) (B) \(\vec{B}\) (C) \(\vec{E} \times \vec{B}\) (D) None of these
A capacitor is connected in an electric circuit. When key is pressed, the current in the circuit is (A) Zero (B) Maximum (C) Any transient value (D) Depends on capacitor used
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