An electric dipole of the moment P is released in a uniform electric field E from the position of maximum torque. The angular speed of the dipole when P becomes parallel to E will be [l = moment of inertia of dipole]

1.  2PEI

2.  PEI

3.  4PEI

4.  2IPE

Subtopic:  Electric Dipole |
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A charge Q is given to a conducting sphere of radius R. Now if a charge -Q is placed, as shown, at a distance r from the center, then the magnitude of the force of attraction between charges is

1.  14πε0Q2r2

2.  <14πε0Q2r2

3.  >14πε0Q2r2

4.  14πε0Q2r-R2

 

Subtopic:  Coulomb's Law |
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If the electric flux entering and leaving a closed surface are respectively of magnitude ϕ1 and ϕ2, then the electric charge inside the surface will be

1.  ε0ϕ2-ϕ1

2.  ϕ1-ϕ2/2ε0

3.  ε0ϕ2+ϕ1

4.  ϕ2-ϕ1ε0

Subtopic:  Gauss's Law |
 62%
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Electric field at an axial point of short dipole is  E1. If the electric field at the equatorial point of same dipole is E2, then which of the following is correct?

1.  E1 . E2 < 0

2.  E1 . E2 > 0

3.  E1 . E2 = 0

4.  E1 . E2 = 0

Subtopic:  Electric Dipole |
 51%
From NCERT
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A long thin rod is charged such that charge per unit length of the rod is λ. The rod is inserted into a hollow spherical surface of radius R. Maximum electric flux coming out the surface is

1.  λRε0

2.  2λπR2ε0

3.  2λRε0

4.  2λR2ε0

Subtopic:  Gauss's Law |
 64%
From NCERT
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Two charges q and 4q are separated by a distance r. The neutral point(in between the line joining the charges) is at a distance:

1.  r3from q

2.  2r3from q

3.  2r from q

4.  r from 4q

Subtopic:  Electric Field |
 82%
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A positron and a proton are projected normally into a uniform electric field with equal kinetic energy. The trajectory followed by them are

1.  Circular with equal radius

2.  Elliptical with the same major and minor axis

3.  Parabolic with the identical trajectory

4.  Hyperbolic with the identical trajectory

 

Subtopic:  Electric Field |
 70%
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The distance between two point charges is increased by 10%. The force of interaction

1.  Increases by 10%

2.  Decreases by 10%

3.  Decreases by 17%

4.  Increases by 17%

Subtopic:  Coulomb's Law |
 66%
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Cm is the SI unit of 

1.  Electric flux

2.  Electric potential

3.  Electric dipole moment

4.  Electric field intensity

Subtopic:  Electric Dipole |
 82%
From NCERT
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A solid sphere of radius R has a uniform distribution of electric charge in its volume. At a distance x from its center (x<R), the electric field is directly proportional to

1.  1x2

2.  1x

3.  x

4.  x2

Subtopic:  Electric Field |
 69%
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