PhysicsHardHigh School (11–12)Electricity & Magnetism › Alternating CurrentNEETAEEE (Amrita)AMUEEEAP EAPCETBCECECMI Entrance
Created by StemPy LabAssertion (A): A capacitor is joined to an alternating source whose rms voltage is fixed. The frequency of the source is doubled, and the rms current in the capacitor becomes twice as large. Reason (R): The reactance of a capacitor increases as the frequency of the applied voltage increases, so a capacitor lets higher frequencies pass less easily.
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← The figure shows a resistor, an inductor and a capacitor in series with an alternating source of constant rms voltage. Three voltmeters read the rms voltages across them: 60 V, 100 V and 20 V. The frequency of the source is then changed until the arrangement is in resonance. The source voltage and the resistance stay the same. What does the voltmeter across the resistor read now?The figure shows how the photocurrent of a photocell depends on the potential of its collector, for three narrow beams of single-colour light, 1, 2 and 3. The beams fall in turn on the same cathode in the same tube. The stopping potentials and the saturation currents are read straight from the curves. Which conclusion can be drawn from the figure alone? →
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