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Three identical charges are placed at co...

Three identical charges are placed at corners of a equilateral triangel of side l. If force between any two charges is F, the work required to double the dimensiions of triangle is

A

`-3Fl`

B

`3Fl`

C

`(-3//2)Fl`

D

`(3//2)Fl`

Text Solution

Verified by Experts

The correct Answer is:
C
`W=/_\U_i`
`=U_f-U_i`
`=3[1/(4piepsilon_0).(qq)/(2l)]-3[1/(4piepsilon_0).(qq)/l]`
`=(-3/2)(1/(4piepsilon_0).q^2/l^2)l=-3/2Fl`
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DC PANDEY-ELECTROSTATICS-Level 1 Objective
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  9. Four positive charges (2sqrt2-1)Q are arranged at the four corners of ...

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  10. A proton is released from rest, 10 cm from a charged sheet carrying ch...

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  11. Two point charges +q and -q are placed a distance x apart. A third ch...

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  12. Charge 2q and -q are placed at (a,0) and (-a, 0) as shown in the figur...

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  13. Five point charge (+q each) are placed at the five vertices of a regul...

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  18. Charges Q, 2Q, and -Q are given to three concentric conducting spheric...

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  19. The electric field in a region of space is given by E=5hati+2hatjN//C....

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  20. A charges Q is placed at each of the two opposite corners of a square....

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