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When a glass rod is rubbed with a silk c...

When a glass rod is rubbed with a silk cloth, charges appear on both. A similar phenomenon is observed with many other pairs of bodies. Explain how this observation is consistent with the law of conservation of charge.

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Charge is not created or destroyed it is merely transferred from one body to another
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when a glass rod is rubbed with silk cloth, both get charged.

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Figure shows a metal rod PQ resting on the smooth rails AB and positioned between the poles of a permanent magnet. The rails, the rod and the magnetic field are in three mutually perpendicular directions. A galvonometer G connects the rails through a switch K. Length of rod = 15 cm, B = 0.50 T, resistance of the closed loop containing the rod = 9.0mOmega . Assume the field to be uniform. a. Suppose K is open and the rod is moved with a speed of 12cms^(-1) in the direction shown. Give the polarity and magnitude of the induced emf. b. Is there an excess charge built up at the ends of the rods when K is open? What if K is closed? c. With K open and the rod moving uniformly, there is no net force on the electrons in the rod PQ eventhough they do experience magnetic force due to the motion of the rod. Explain. d. What is the retarding force on the rod when K is closed? e. How much power is required (by an external agent) to keep the rod moving at the same speed (=12cms^(-1)) when K is closed? How much power is required when K is open? f. How much power is dissipated as heat in the closed circuit? What is the source of this power? g. What is the induced emf in the moving rod if the magnetic field is parallel to the rails instead of being perpendicular?

Assertion : When both the strips of electroscope is charged with similar charge, they repel each other and become wide open. Reason : Like charges always repel each other.

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NCERT TAMIL-ELECTRIC CHARGES AND FIELDS -EXERCISES
  1. A mass m(1) is moving on a plane surface along a straight path under t...

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  2. a. Explain the meaning of the statement 'electric charge of a body is ...

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  3. When a glass rod is rubbed with a silk cloth, charges appear on both. ...

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  4. Four point charges q(A) = 2 mu C , q(B) = -5 mu C, q(C) = 2 mu C and ...

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  5. (a) An electrostaic field line is a continous curve. That is a field l...

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  6. Two point charges q(A) = 3 mu C and q(B) = -3 muC are located 20 cm ...

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  7. A system has two charges q(A)= +2.5xx10^(-7)C and q(B)= -2.5xx10^(-7)C...

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  8. An electrtic dipole with dipole moment 4xx10^(-9) C m is aligned at ...

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  9. A polythene piece rubbed will wool is found to have a negative charge ...

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  10. Two insulated charged copper spheres A and B have their centres separa...

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  11. Two insulated identically sized charged copper spheres A and B have th...

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  12. Track of three charged particles in a uniform electrostatic field s...

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  13. Consider a uniform eleceric field =3 xx 10^(3) hati N//C. a. What is...

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  14. What is the net flux of the uniform electric field of Exercise 1.15 th...

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  15. Careful measurement of the electric field at the surface of a black...

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  16. A point charge +10mu C is at a distance 5 cm directly above the centre...

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  17. A point charge of 2.0 mu c is at the centre of a cubic gaussian ...

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  18. A point charge causes an electric flux of -1.0xx10^(3) N m^(2)//C to p...

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  19. A conducting sphere of radius 10 cm has an unknown charge if the elect...

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  20. A uniformaly charged conducting sphere of diameter 2.4 m has a surface...

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