WB JEE 2008
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A wire of length 5 m is stretched by 1 mm by a force of 1 N. What is the value of energy stored in the wire?
Prove that if the ratio \({{z - i} \over {z - 1}}\) is purely imaginary, the point z lies on the circle in the Argand plane whose centre is at the point \({1 \over 2}(1 + i)\) and radius is \({1 \over {\sqrt 2 }}\).
Two wires each of same material and same length have 2 L 1 ratio of their radii. If the first wire has a resistance of 2 \(\Omega\) then what will be the equivalent resistance of the two wires when they are connected in series?
If an unbiased coin is tossed n times. Find the probability that head appears an odd number of times.
A 60 W - 220 V bulb is connected in series with another bulb 40 W - 220 V. Which bulb will give more illuminance ?
Find the general solution of \(\sec \theta + 1 = (2 + \sqrt 3 )\tan \theta\).