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Two equally charged small metal balls pl...

Two equally charged small metal balls placed at a fixed distance experience a force F. A similar unchanged metal ball after touching one of them is placed at the middle point between the two balls. The force experienced by this ball is

A

F/2

B

2F

C

3F

D

4F

Text Solution

Verified by Experts

The correct Answer is:
A
`F_(2)=k(Q(Q/2))/((r/2)^(2))-k((Q/2)(Q/2))/((r/2)^(2))=2R-F=F`
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NARAYNA-ELECTRIC CHARGES AND FIELDS-EXERCISE -1 (C.W)
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  2. Coulomb's law for electric charges, most closely resembles

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  3. The ratio of the force between two small conducting spheres of equal c...

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  4. Two identical metals balls with charges +2Q and -Q are separated by so...

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  5. Two equally charged small metal balls placed at a fixed distance exper...

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  6. There are two charges +2 mu C and -6 mu C at certain separation.Then ...

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  7. Two particles , each of mass m and carrying charge Q , are separated b...

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  8. Two particles having charge Q(1) and Q(2) , when kept at a certain dis...

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  9. Four charges are arranged at the corners of a square ABCD, as shown. ...

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  10. The electric field inside a spherical shell of uniform surface charge ...

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  11. the electric field intensity at apoint in space is equal in magnitude ...

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  12. A sphere of radius R has a uniform distribution of electric charge in ...

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  13. The electric field at the surface of a charged spherical conductor is ...

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  14. The electrons are accelerated through a pontential difference V by an ...

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  15. The total electric flux leaving a spherical surface of radius 1 cm and...

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  16. A uniform electric field Ehati exists in a region containing the orign...

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  17. A charge q is placed at the centre of the line joining two equal charg...

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  18. A metallic solid sphere is placed in a uniform electric fied. The line...

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  19. In the situatiioni when the Gaussian surface is so chosen that there a...

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  20. Three charges q(1)=1 mu c,q(2)=2 mu c and q(3)=-3 mu c and four surfac...

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