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Chapter 17: Problem 4
The electromagnetic waves do not transport (A) Energy (B) Charge (C) Momentum (D) Information
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Instantaneous displacement current \(1 \mathrm{~A}\) in the space between the parallel plates of \(1 \mu \mathrm{F}\) capacitor can be established by changing the potential difference at the rate of (A) \(0.1 \mathrm{~V} / \mathrm{s}\) (B) \(1 \mathrm{~V} / \mathrm{s}\) (C) \(10^{6} \mathrm{~V} / \mathrm{s}\) (D) \(10^{-6} \mathrm{~V} / \mathrm{s}\)
The charge on a parallel plate capacitor is varying as \(q=q_{0} \sin 2 \pi \cdot n t\) The plates are very large and close together. Neglecting the edge effects, the displacement current through the capacitor is (A) \(\frac{q}{\varepsilon_{0} A}\) (B) \(\frac{q_{0}}{\varepsilon_{0}} \sin 2 \pi n t\) (C) \(2 \pi n q_{0} \cos \pi n t\) (D) \(\frac{2 \pi n q_{0}}{\varepsilon_{0}} \cos 2 \pi n t\)
The sun radiates electromagnetic energy at the rate of \(3.9 \times 10^{26} \mathrm{~W}\). Its radius is \(6.96 \times 10^{8} \mathrm{~m}\). The intensity of sun light at the solar surface will be (A) \(1.4 \times 10^{4}\) (B) \(2.8 \times 10^{5}\) (C) \(4.2 \times 10^{6}\) (D) \(5.6 \times 10^{7}\)
Electromagnetic waves do not transport (A) Energy (B) Charge (C) Momentum (D) Information
Kenneley's Heaviside layer lies between (A) \(50 \mathrm{~km}\) to \(80 \mathrm{~km}\) (B) \(80 \mathrm{~km}\) to \(400 \mathrm{~km}\) (C) beyond \(110 \mathrm{~km}\) (D) beyond \(250 \mathrm{~km}\)
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