Home
Class 12
PHYSICS
Three point charges q,-2q and -2q are pl...

Three point charges `q,-2q and -2q` are plaed at the vertices of an equilateral triangle of side a. The work done by some external force to increase their separation to 2a will be

Text Solution

Verified by Experts

The correct Answer is:
0
`W = U_f - U_i`
where `U_i = (1)/(4 pi epsilon_0 a) xx [(-2 q)(-2q)+(-2q)(q) + (q)(-2q)] = 0`
Also, `U_f = 0`, so `W = 0`.
Promotional Banner

Topper's Solved these Questions

  • ELECTRIC POTENTIAL

    CENGAGE PHYSICS ENGLISH|Exercise DPP 3.1|14 Videos

  • ELECTRIC POTENTIAL

    CENGAGE PHYSICS ENGLISH|Exercise DPP 3.2|15 Videos

  • ELECTRIC POTENTIAL

    CENGAGE PHYSICS ENGLISH|Exercise Comprehension|31 Videos

  • ELECTRIC FLUX AND GAUSS LAW

    CENGAGE PHYSICS ENGLISH|Exercise MCQ s|38 Videos

  • ELECTRICAL MEASURING INSTRUMENTS

    CENGAGE PHYSICS ENGLISH|Exercise M.C.Q|2 Videos

Similar Questions

Explore conceptually related problems

The point charges -2q, -2q and +q are put on the vertices of an equilateral triangle of side a . Find the work done by some external force in increasing the separation to 2a (in joules).

Three charges 2q, -q, and -q are located at the vertices of an equilateral triangle. At the center of the triangle,

Three charges +q, +q and -2q are placed at the vertices of an equilareral triagle. What is the dipole moment of the system?

Consider the charges q,q and -q placed at the vertices of an equilateral triangle of each side l. What is the force on each charge ?

Three point charges q are placed at three vertices of an equilateral triangle of side a. Find magnitude of electric force on any charge due to the other two.

(a) Three point charges q,-4q and 2q are placed at the vertices of an equilateral triangle ABC of side 'l' as shown in the figure. Obtain the expression for the magnitude of the resultant electric force acting on the charge q. (b) Find out the amount of the work 4one to separate the charges at infinite distance.

Three pont charges q, q & - 2q placed, at the corners of equilateral triangle of side 'L ' Calculate work done by extemal force in moving all the charges far apart without acceleration

Three points charges of 1 C, 2C and 3C are placed at the corners of an equilateral triangle of side 100 cm. Find the work done to move these charges to the corners of a similar equilateral triangle of side 50 cm.

Three points charges of 1 C, 2C and 3C are placed at the corners of an equilateral triangle of side 100 cm. Find the work done to move these charges to the corners of a similar equilateral triangle of side 50 cm.

Three poistive charges of equal value q are placed at the vertices of an equilateral triangle. The resulting lines of force should be sketched as in