State which of the two a capacitor or an inductor, tends to become SHORT when the frequency of the applied alternating voltage has a high value.
The capacitor. 1
Detailed Answer :
Between inductor and capacitor, the capacitor will act short at high frequencies while will act open at low frequencies. So at high frequencies, capacitor has time to get a very less amount of charge while at low frequencies, there is lot of time for capacitor to collect considerable amount of charge which shows presence of large reverse voltage. Hence the sum of the voltages of capacitor and ac source will be nearly zero which shows current also to be nearly zero.
Detailed Answer :
Between inductor and capacitor, the capacitor will act short at high frequencies while will act open at low frequencies. So at high frequencies, capacitor has time to get a very less amount of charge while at low frequencies, there is lot of time for capacitor to collect considerable amount of charge which shows presence of large reverse voltage. Hence the sum of the voltages of capacitor and ac source will be nearly zero which shows current also to be nearly zero.
Show that in the free oscillations of an LC circuit, the sum of energies stored in the capacitor and the inductor is constant in time.
Obtain the expression for the energy density of magnitude field B produced in the inductor.
In electric arc furnace Cu or Iron is melted due to variation of
(a) current
(b) magnetic field
(c) voltage
(d) electric field
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(a) 4X
(b) X/2
(c) X/4
(d) 2X
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For any charge configuration, equipotential surface through a point is normal to the electric field. Justify.
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When electrons drift in a metal from lower to higher potential, does it mean that all the free electrons of the metal are moving in the same direction ?
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i) W₁ > W₂
(ii) W₁ = W₂
(iii) W₁ < W₂
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