Physics-
General
Easy
Question
The capacitor of capacitance C can be charged (with the help of a resistance R) by a voltage source V, by closing switch 
while keeping switch 
open. The capacitor can be connected in series with an inductor ‘L’ by closing switch and opening .
Initially, the capacitor was uncharged. Now, switch is closed and is kept open. If time constant of this circuit is 
, then
- after time interval , charge on the capacitor is CV/2
- after time interval 2, charge on the capacitor is CV(1 –
)
- the work done by the voltage source will be half of the heat dissipated when the capacitor is fully charged
- after time interval 2, charge on the capacitor is CV(1 –
)
, charge on the capacitor is CV/2
, charge on the capacitor is CV(1 – )
, charge on the capacitor is CV(1 – )
The correct answer is: after time interval 2, charge on the capacitor is CV(1 – )
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After insertion of rod which of the following quantities will change with time?
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Statement-1 : Consider the arrangement shown below. A smooth conducting rod, CD, is lying on a smooth U-shaped conducting wire making good electrical contact with it. The U-shape conducting wire is fixed and lies in horizontal plane. There is a uniform and constant magnetic field B in vertical direction (perpendicular to plane of page in figure). If the magnetic field strength is decreased, the rod moves towards right.
Statement-2 : In the situation of statement-1, the direction in which the rod will slide is that which tends to maintain constant flux through the loop. Providing a larger loop area counteracts the decrease in magnetic flux. So the rod moves to the right independent of the fact that the direction of magnetic field is into the page or out of the page.
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Statement-2 : In the situation of statement-1, the direction in which the rod will slide is that which tends to maintain constant flux through the loop. Providing a larger loop area counteracts the decrease in magnetic flux. So the rod moves to the right independent of the fact that the direction of magnetic field is into the page or out of the page.
physics-General
