PhysicsHardHigh School (11–12)Electricity & Magnetism › Current ElectricityNEETAEEE (Amrita)AMUEEEAP EAPCETBCECECMI Entrance
Created by StemPy LabFive statements about free electrons in a metal wire are given. (i) The SI unit of mobility is . (ii) For a fixed current, the drift speed is larger where the wire is thinner. (iii) At a fixed electric field, the drift speed is proportional to the relaxation time. (iv) The electric current is a vector, because it has a direction. (v) The random speed of the free electrons is much smaller than their drift speed. How many are correct?
← All Quizzes
← A ring of uniform wire has a total resistance of 24 Ω. A straight wire of resistance 12 Ω joins two points A and B of the ring, and the radii OA and OB make an angle of 120°, as the figure shows. A battery is connected between A and B. What is the equivalent resistance between A and B?A uniform wire has resistance R. Four new arrangements are made from it, with no material lost. Match each arrangement with its resistance. List-I (Arrangement) A. The wire stretched to twice its length B. A wire of the same metal and length, with twice the radius C. The wire cut in four equal pieces joined in parallel D. The wire stretched to four times its length List-II (Resistance) I. R/16 II. 4R III. 16R IV. R/4 →
Discussion (0)
Log in to join the discussion.
Loading…