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current electricity | basic questions | Physics class 12 | advguruji | Physics Advocate

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 supply voltage available is 100 V then what current will be drawn by the bulb?


----------------------------------------------------------------------
           ANSWERS

A1.
560 Am-²

A2.
136 A

A3.
85 C, 106 C

Introduction to CURRENT ELECTRICITY (Basic Concepts)

by  www.advguruji.blogspot.com
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