1
JEE Main 2020 (Online) 5th September Evening Slot
+4
-1
A parallel plate capacitor has plate of length 'l', width ‘w’ and separation of plates is ‘d’. It is connected to a battery of emf V. A dielectric slab of the same thickness ‘d’ and of dielectric constant k = 4 is being inserted between the plates of the capacitor. At what length of the slab inside plates, will the energy stored in the capacitor be two times the initial energy stored?
A
$${l \over 4}$$
B
$${l \over 2}$$
C
$${{2l} \over 3}$$
D
$${l \over 3}$$
2
JEE Main 2020 (Online) 5th September Evening Slot
+4
-1
In the circuit shown, charge on the 5 $$\mu$$F capacitor is :
A
5.45 $$\mu$$C
B
18.00 $$\mu$$C
C
10.90 $$\mu$$C
D
16.36 $$\mu$$C
3
JEE Main 2020 (Online) 5th September Morning Slot
+4
-1
Two capacitors of capacitances C and 2C are charged to potential differences V and 2V, respectively. These are then connected in parallel in such a manner that the positive terminal of one is connected to the negative terminal of the other. The final energy of this configuration is :
A
Zero
B
$${3 \over 2}C{V^2}$$
C
$${9 \over 2}C{V^2}$$
D
$${{25} \over 6}C{V^2}$$
4
JEE Main 2020 (Online) 4th September Evening Slot
+4
-1
A capacitor C is fully charged with voltage V0. After disconnecting the voltage source, it is connected in parallel with another uncharged capacitor of capacitance $${C \over 2}$$. The energy loss in the process after the charge is distributed between the two capacitors is :
A
$${1 \over 2}CV_0^2$$
B
$${1 \over 4}CV_0^2$$
C
$${1 \over 3}CV_0^2$$
D
$${1 \over 6}CV_0^2$$
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