Explanation:
As the rod is of uniform mass distribution and stretched by its own weight, the topmost part of the rod experiences maximum stress due to the weight of the entire rod. This stress leads to lateral strain and the rod becomes thinner. Moving down along the length of the rod, the stress decreases because the lower parts bear lesser weight of the rod. With reduced stress, the lateral strain also reduces. Hence, the diameter of the rod gradually increases from top to bottom.
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When a wire of uniform cross-section a, length l and resistance R is bent into a complete circle, resistance between any two of diametrically opposite points will be
|
(a) |
(b) |
(c) 4R |
(d) |
A long straight wire carries an electric current of 2A. The magnetic induction at a perpendicular distance of 5m from the wire is
|
(a) 4 |
(b) 8 |
(c) 12 |
(d) 16 |
The total capacity of the system of capacitors shown in the adjoining figure between the points A and B is
|
(a) 1 μF |
(b) 2 μF |
(c) 3 μF |
(d) 4 μF |
