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 Multiple Choice QuestionsMultiple Choice Questions

61.

Two small charged spheres A and B have charges 10 C and 40 C respectively and are held at a separation of 90 cm from each other. At what distance from A, the electric intensity would be zero?

  • 22.5 cm

  • 18 cm

  • 36 cm

  • 30 cm


62.

A charged particle moves in an electric field from A to B, then from B to A :

  • If WAB > WBA, then the field is conservative

  • If WAB + WBA = 0, then the field is conservative

  • If WAB + WBA > 0, then the field is conservative

  • If WAB = WBA, then the field is conservative


63.

What is the angle between the electric dipole moment and the electric field strength due to it on the equatorial line?

  • 90°

  • 180°

  • None of these


64.

Two spheres of radii R1 and R2 respectively are charged and joined by a wire. The ratio of the electric field of spheres is :

  • R22R12

  • R12R22

  • R2R1

  • R1R2


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65.

The figure shows three points A, B and C in a region of a uniform electric field E. The line AB is perpendicular and BC is parallel to the field lines. Then which of the following holds good?

 

  • VA = VB = VC

  • VA = VB > VC

  • VA = VB < VC

  • VA > VB = VC


66.

The unit of permittivity (ε0) of space is

  • newton-metre/ coulomb2

  • coulomb / newton-metre

  • coulomb / newton-metre2

  • coulomb/ newton-metre2


67.

Two charges each of equal magnitude 3.2 x 10-19 coulomb but of opposite sign form an electric dipole. The distance between the two charges is 2.4 A. If the dipole is placed in an electric field of 5 x 105 volt/metre, then in equilibrium its potential energy will be

  • 3 × 15-23 joule

  • -3.84 × 10-23 joule

  • -6 × 10-23 joule 

  • -2 × 10-26 joule 


68.

1 newton/coulomb is equivalent to

  • 1 C/V

  • 1 J

  • 1 V/M

  • 1 J/C


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69.

An electron is moving with velocity v on a circular path of radius r in a transverse electric field B. The specific charge (e/m) of the electron is

  • Bvr

  • νBr

  • Bvr2

  • B


70.

Number of extra electrons in a body of charge -80μC, is

  • 80 × 1015

  • 80 × 10−15

  • 5 × 1014

  • 1.28 × 10−17


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