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. ---------------------------------------------------------------------- ANSWERS A1. 560 Am-² A2. 136 A A3. 85 C, 106 C Introduction to CURRENT ELECTRICITY (Basic Concepts) CLICK HERE by www.advguruji.blogspot.com
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