JEE/ NEET | Physics | Current Electricity | MCQ | Lecture 6

00:00 Problem 1. 62.5×10^18 electrons per second are flowing through a wire of area of cross-section 0.1 m², the value of current flowing will be
02:20 Problem 2. A current of 1 mA is flowing through a copper wire. How many electrons will pass a given point in one second [e = 1.6 x 10^-19 Coulomb]
03:55 Problem 3. A source of e.m.f. E = 15 V and having negligible internal resistance is connected to a variable resistance so that the current in the circuit increases with time as i = 1.2t + 3. Then, the total charge that will flow in first five seconds will be
07:00 Problem 4. In a neon discharge tube 2.9×10^18 Ne+ ions move to the right each second while 1.2×10^18 electrons move to the left per second. Electron charge is 1.6×10^-19C. The current in the discharge tube
11:25 Problem 5. When the current i is flowing through a conductor, the drift velocity is v. If 2i current is flowed through the same metal but having double the area of cross-section, then the drift velocity will be
18:47 Problem 6. Which of the following characteristics of electrons determines the current in a conductor
19:16 Problem 7. A current I is passing through a wire having two sections Pand Q of uniform diameters d and d/2 respectively. If the mean drift velocity of electrons in sections P and Q is denoted by up and vo respectively, then
21:46 Problem 8. The drift velocity does not depend upon
22:00 Problem 9. A beam contains 2 × 108 doubly charged positive ions per cubic centimeter, all of which are moving with a speed of 105 m/s. The current density is
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