Home
Class 12
PHYSICS
If the charge on a capacitorn is increas...

If the charge on a capacitorn is increased by 2C, then the energy stored in it increases by 20 %. The original charge on the capacitor is

A

10 C

B

20 C

C

30 C

D

40 C

Text Solution

Verified by Experts

The correct Answer is:
b
Since `U=(1)/(2)(Q^(2))/(C),therefore1.21U=(1)/(2)((Q+2)^(2))/(C)`
`therefore(1.21)/(1)=((Q+2)^(2))/(Q)orsqrt((1.21)/(1)=(Q+2)/(Q)`
or `1.1Q=Q+2therefore(1.1-1)Q=2`
or `0.1Q=2thereforeQ=(2)/((1//10))=20C`.
Promotional Banner

Topper's Solved these Questions

  • ELECTROSTATICS

    MTG-WBJEE|Exercise (WB JEE / WORKOUT )CATEGORY 3 : One or More than One Option Correct Type (2 Marks)|10 Videos

  • ELECTROSTATICS

    MTG-WBJEE|Exercise (WB JEE Previous Years Questions ) CATEGORY 1 : Single Option correct Type|23 Videos

  • ELECTROSTATICS

    MTG-WBJEE|Exercise (WB JEE Previous Years Questions ) CATEGORY 3 : One or More than One Opion correct Type|4 Videos

  • ELECTROMAGNETIC WAVES

    MTG-WBJEE|Exercise WB JEE WORKOUT (CATEGORY 3 : ONE OR MORE THAN ONE OPTION CORRECT TYPE)|10 Videos

  • GRAVITATION

    MTG-WBJEE|Exercise WB JEE Previous Years Questions (CATEGORY 1: Single Option Correct Type|7 Videos

Similar Questions

Explore conceptually related problems

If the charge on a capacitor is increased by 2C, then the energy stored in it increases by 21 %. The original charge on the capacitor is

If the charge on a body is increased by an amount of 6C ,the energy stored in it increases by 44% .The original charge on the body ?

If momentum is increased by 20%, then kinetic energy increases by

The charge on a 48 muF capacitor is increased from 0.1 C to 0.5 C. the enerrgy stored in the capacitor increases by

Find the charge stored in the capacitor.

Find the charge stored in the capacitor.

Find the charge stored in the capacitor.

If a 4 muF capacitor is charged to 1KV, then energy stored is conductor is

The capacitance of a charged capacitor is C and the energy stored in it is U. What is the value of charge on the capacitor?

If a 4muF capacitor is charged to 1 kV, then energy stored in the capacitor is