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A charge +q is fixed to each of three co...

A charge `+q` is fixed to each of three corners of a square .On the empty corner a charge `Q` is placed such that there is no net electrostatic force acting on the diagonally opposite charge then

A

`Q=-2q`

B

`Q=-2sqrt(2)q`

C

`Q=-sqrt(2q)`

D

`Q=-4q`

Text Solution

Verified by Experts

The correct Answer is:
B
`1/(4 pi epsilon_(0)) sqrt(2) (q^(2))/(a^(2))+1/(4 p epsilon_(0)) (Qq)/((sqrt(2)a)^(2))=0`
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NARAYNA-ELECTRIC CHARGES AND FIELDS-EXERCISE -2 (H.W)
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  9. A large flat metal surface has a uniform charge density +sigma. An ele...

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  10. n charges Q,4Q,9Q,16Q…. are placed at distance of 1,2,3….. metre form ...

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  11. Two point charge q(1)=2muC and q(2)=1muC are placed at distance b=1 an...

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  12. A regular pentagon has four charges each +q at four of its vertices. A...

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  13. Two point charges a and b whose magnitude are same, positioned at a ce...

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  14. Find out electridc filed intensity at point A(1,0,2) due to a point ch...

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  15. An electric dipole consists of two opposite charges of magnitude 1muC ...

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  16. An electric dipole is formed by two particles fixed at the ends of a l...

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  17. For an electric dipole consisting of a positive and equal negative cha...

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  18. Two equal charges q of opposite sign are separated by a small distance...

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  19. The inward and outward electric flux for a closed surface unit of N-m^...

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  20. A cylinder of radius R and length L is placed in the uniform electric ...

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