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Two positive point charges of 12 mu C an...

Two positive point charges of `12 mu C` and `8 mu C` are `10 cm` apart. The work done in bringing then `4 cm` closer is

A

7.2J

B

3.6J

C

8.4J

D

12.4J

Text Solution

Verified by Experts

The correct Answer is:
A
`w= (1)/(4pi in_(0)) ((1)/(r_(2)) - (1)/(r_(2)))`
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NARAYNA-ELECTROSTATIC POTENTIAL AND CAPACITANCE-Exercise -1 (H.W)
  1. ABC is an equilateral triangle of side 2m. If vec(E ) = 10NC^(-1), " t...

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  2. The electric potential at a point (x,0,0) is given by V=[(1000)/(x)+(1...

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  3. Two positive point charges of 12 mu C and 8 mu C are 10 cm apart. The ...

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  4. Two charges of magnitude 5 nC and -2 nC are placed at points (2cm,0,0...

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  5. Three charges Q, +q and +q are placed at the vertices of a right angle...

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  6. An electric dipole has the magnitude of its charge as q and its dipole...

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  7. An electric dipole of moment vecp is placed normal to the lines of for...

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  8. An insulated charged conducting sphere of radius 5cm has a potential o...

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  9. Two conducting spheres of radii 5 cm and 10 cm are given a charge of 1...

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  10. The electric potential on the surface of a sphere of radius R due to a...

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  11. A soap bubble is charged to a potential of 16V. Its radius is then dou...

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  12. The charge stored in a capacitor is 20 mu C and the potential differen...

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  13. The oil condenser has a capacity of 100 muF .The oil has dielectric c...

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  14. A dielectric of thickness 5cm and dielectric constant 10 is introduced...

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  15. v36

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  16. The ratio of the resultant capacities when three capacitors of 2muF, 4...

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  17. A condenser A of capacity 4muF has a charge 20muC and another condense...

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  18. A capacitor of 30 mu F charged to 100V is connected in parallel to c...

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  19. The equivalent capacity between the points 'A' and 'B' in the followin...

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  20. Two capacitors with capacities C(1) and C(2) ,are charged to potenti...

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