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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 W

_{AB}> W_{BA}, then the field is conservativeIf W

_{AB}+ W_{BA}= 0, then the field is conservativeIf W

_{AB}+ W_{BA}> 0, then the field is conservativeIf W

_{AB}= W_{BA}, 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?

0°

90°

180°

None of these

64.

Two spheres of radii R_{1} and R_{2} respectively are charged and joined by a wire. The ratio of the electric field of spheres is :

$\frac{{\mathrm{R}}_{2}^{2}}{{\mathrm{R}}_{1}^{2}}$

$\frac{{\mathrm{R}}_{1}^{2}}{{\mathrm{R}}_{2}^{2}}$

$\frac{{\mathrm{R}}_{2}}{{\mathrm{R}}_{1}}$

$\frac{{\mathrm{R}}_{1}}{{\mathrm{R}}_{2}}$

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65.

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

V

_{A}= V_{B}= V_{C}V

_{A}= V_{B}> V_{C}V

_{A}= V_{B}< V_{C}V

_{A}> V_{B}= V_{C}

66.

The unit of permittivity (${\mathrm{\epsilon}}_{0}$) of space is

newton-metre

^{2 }/ coulomb^{2}coulomb / newton-metre

coulomb / newton-metre

^{2}coulomb

^{2 }/ newton-metre^{2}

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 $\stackrel{\circ}{\mathrm{A}}$. If the dipole is placed in an electric field of 5 x 10^{5} 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

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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

$\frac{\mathrm{\nu}}{\mathrm{Br}}$

Bvr

^{2}$\frac{\mathrm{B}}{\mathrm{r\nu}}$

70.

Number of extra electrons in a body of charge -80$\mathrm{\mu}$C, is

80 × 10

^{15}80 × 10

^{−15}5 × 10

^{14}1.28 × 10

^{−17}

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