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Two positive point charges of 12 and 5 m...

Two positive point charges of 12 and 5 microcoulombs, are placed 10 cm apart in air. The work needed to bring them 4 cm closer is

A

3.6 J

B

2.6 J

C

4.8 J

D

6.0 J

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The correct Answer is:
A
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DC PANDEY-ELECTROSTATIC POTENTIAL AND CAPACITORS-(A) Chapter exercises
  1. In the electric field of a point chargde q, a cetrain charge is carrie...

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  2. A unifrom electric field having a magnitude E(0) and direction along t...

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  3. Two positive point charges of 12 and 5 microcoulombs, are placed 10 cm...

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  4. When a charge of 3 coulombs is placed in a uniform electric field, it ...

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  5. A particle A has chrage +q and a particle B has charge +4q with each o...

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  6. Three particles, each having a charge of 10 mu C are placed at the con...

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  7. A mass m=20 g has a charge q= 3.0 mC. It moves with a velocity of 20 m...

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  8. Four idenbtial charges +50 mu C each are placed, one at each corner of...

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  9. Two equal charges q are placed at a distance of 2a and a third charge ...

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  10. An alpha-particle is accelerated through a.p.d of 10^(6) volt the K.E....

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  11. The ratio of moment of an electron and an alpha-particle which are acc...

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  12. Two particles of mass m and 2m with charges 2q and q are placed in a u...

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  13. A spherical condenser has innder and outer spheres of radii a and b re...

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  14. Three charges are placed at the vertices of an equilateral triangle of...

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  15. A particle of mass 2 g and charge 1 muC is held at rest on a frictionl...

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  16. A point charge is surrounded symmetrically by six identical charges at...

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  17. Five capacitors of 10 muF capacity each are connected to a d.c potenti...

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  18. Three capacitors of capacitances 3 muF, 9muF and 18 muF are connected ...

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  19. In the circuit diagram shown in the adjoining figure, the resultant ca...

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  20. Four capacitors of each of capacity 3 muF are connected as shown in th...

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