## Wednesday, 21 September 2022

### CAPACITANCE: MCQ ON CAPACITANCE

A Capacitor is a device which has the ability or capacity to store

energy in the form of an electrical charge producing a potential

difference ( static voltage) across its plates, much like a small

rechargeable battery.

## Q1 A 2μF, 4μF and 10μF capacitor are connected in series. The total capacitance is

• 2μF
• 4μF
• 1.1μF
• 1.5μF

• 1.1μF

Equivalent capacitance in series is 1/C = 1/C1 + 1/C2+1/C3

## Q2 A 10 μF, 20 μF, 22 μF, and 100 μF capacitor are in parallel. The total capacitance is

• 2.43 μF
• 4.86 μF
• 100 μF
• 152 μF

• 152 μF

(Equivalent capacitance in parallel connection is C= C1+ C2+C3)

## Q3 Two Capacitors of 2 μF and 3 μF are connected in series across 10 V. The potential difference across the 2 μF capacitor will be

• 4 V
• 6 V
• 8 V
• 10 V

• 6 V

(Use formulae Q = CV)

## Q4 Work done in charging a capacitor is

• \frac{1}{2}QV
• QV
• Q^{2}V
• 2QV

• \frac{1}{2}QV

## Q5 Energy store in a 4000 μF capacitor charged to a potential difference of 50V will be

• 50J
• 10J
• 5J
• 100J

• 5J Energy stored in a charged capacitor is  \frac{1}{2}CV^{2}

## Q6 We get maximum energy from a set of capacitors?

• When they are connected in parallel.
• When they are connected in series.
• Both a and b.
• None of these.

• Both a and b.

Q7 If the charge in a capacitor is 4C and the energy stored in it is 4J, find the value of capacitance.

• 2F
• 4F
• 8F
• 16F

2F

• True
• False

• True

## Q9 If the distance between the plates of parallel plate capacitor is halved and the dielectric constant is doubled, then its capacity will

• Increase by 16 times
• Increase by 4 times
• Increase by 2 times
• remains the same

• Increase by 4 times

## Q10 A parallel plate capacitor is charged and then isolated. When a dielectric material is inserted between the plates of the capacitor, which of the following does not change ?

• Electric field between the plates
• Energy stored in the capacitor
• Potential difference across the plates
• Charge on plates

• Charge on plates