Q1. An electron beam has an aperture of 2 mm². A total of 7 × 10¹⁵ electrons flow through any perpendicular cross-section per second. Calculate the current density of the electron beam. Q2. The charge in a given wire varies with time, given by - q = 3t³ - t² Where, q in 'C' and t in 'secs'. Find the current flowing in the wire at 4th second. Q3. The current flowing in a conductor is the function of time, given by - I = 8t - 3 Where, I in 'Ampere' and t in'secs'. Find the total charge flowed in first 5 seconds in the conductor. Also, find the charge which flowed from 6th to 8th second. Q4. A storage battery of EMF 8 volt and internal resistance 0.5 ohm is being charged by a 120 volt dc supply using a series resistor of 15.5 ohm. What is the terminal voltage of the battery during charging? What is the purpose of having a series resistor in the charging circuit? Q5. The manufacturer sticker on an electric bulb reads 220 V, 60 W. If the s...
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