1
JEE Main 2019 (Online) 12th January Evening Slot
+4
-1
A parallel plate capacitor with plates of area 1 m2 each, are at a separation of 0.1 m. If the electric field between the plates is 100 N/C, the magnitude of charge on each plate is :

(Take $$\varepsilon$$0 = 8.85 $$\times$$ 10$$-$$12 $${{{C^2}} \over {N - {m^2}}}$$)
A
9.85 $$\times$$ 10–10 C
B
8.85 $$\times$$ 10–10 C
C
6.85 $$\times$$ 10–10 C
D
7.85 × 10–10 C
2
JEE Main 2019 (Online) 12th January Evening Slot
+4
-1
In the circuit shown, find C if the effective capacitance of the whole circuit is to be 0.5 $$\mu$$F. All values in the circuit are in $$\mu$$F.

A
$${6 \over 5}\mu F$$
B
$${7 \over 11}\mu F$$
C
4$$\mu$$F
D
$${7 \over 10}\mu F$$
3
JEE Main 2019 (Online) 12th January Evening Slot
+4
-1
The charge on a capacitor plate in a circuit, as a function of time, is shown in the figure :

When is the value of current at t = 4 s ?
A
zero
B
1.5 $$\mu$$A
C
2 $$\mu$$A
D
3 $$\mu$$A
4
JEE Main 2019 (Online) 12th January Morning Slot
+4
-1
In the figure shown, after the switch 'S' is turned from position 'A' to position 'B', the energy dissipated in the circuit in terms of capacitance 'C' and total charge 'Q' is :

A
$${1 \over 8}{{{Q^2}} \over C}$$
B
$${5 \over 8}{{{Q^2}} \over C}$$
C
$${3 \over 4}{{{Q^2}} \over C}$$
D
$${3 \over 8}{{{Q^2}} \over C}$$
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