1
JEE Main 2022 (Online) 30th June Morning Shift
+4
-1

Co is the capacitance of a parallel plate capacitor with air as a medium between the plates (as shown in Fig. 1). If half space between the plates is filled with a dielectric of relative permittivity $$\varepsilon$$r (as shown in Fig. 2), the new capacitance of the capacitor will be :

A
$${{{C_o}} \over 2}(1 + {\varepsilon _r})$$
B
$${C_o} + {\varepsilon _r}$$
C
$${{{C_o}{\varepsilon _r}} \over 2}$$
D
$${C_o}(1 + {\varepsilon _r})$$
2
JEE Main 2022 (Online) 29th June Evening Shift
+4
-1

A capacitor is discharging through a resistor R. Consider in time t1, the energy stored in the capacitor reduces to half of its initial value and in time t2, the charge stored reduces to one eighth of its initial value. The ratio t1/t2 will be

A
1/2
B
1/3
C
1/4
D
1/6
3
JEE Main 2022 (Online) 29th June Morning Shift
+4
-1

A parallel plate capacitor filled with a medium of dielectric constant 10, is connected across a battery and is charged. The dielectric slab is replaced by another slab of dielectric constant 15. Then the energy of capacitor will :

A
increase by 50%
B
decrease by 15%
C
increase by 25%
D
increase by 33%
4
JEE Main 2022 (Online) 27th June Morning Shift
+4
-1

A force of 10 N acts on a charged particle placed between two plates of a charged capacitor. If one plate of capacitor is removed, then the force acting on that particle will be.

A
5 N
B
10 N
C
20 N
D
Zero
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