1
JEE Main 2021 (Online) 27th August Evening Shift
Numerical
+4
-1
The ratio of the equivalent resistance of the network (shown in figure) between the points a and b when switch is open and switch is closed is x : 8. The value of x is ___________.

2
JEE Main 2021 (Online) 27th August Morning Shift
Numerical
+4
-1
First, a set of n equal resistors of 10 $$\Omega$$ each are connected in series to a battery of emf 20V and internal resistance 10$$\Omega$$. A current I is observed to flow. Then, the n resistors are connected in parallel to the same battery. It is observed that the current is increased 20 times, then the value of n is ............... .
3
JEE Main 2021 (Online) 27th July Evening Shift
Numerical
+4
-1
For the circuit shown, the value of current at time t = 3.2 s will be _________ A.

[Voltage distribution V(t) is shown by Fig. (1) and the circuit is shown in Fig. (2)]
4
JEE Main 2021 (Online) 25th July Morning Shift
Numerical
+4
-1
An electric bulb rated as 200 W at 100 V is used in a circuit having 200 V supply. The resistance 'R' that must be put in series with the bulb so that the bulb delivers the same power is _____________ $$\Omega$$.
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