An electric dipole with dipole moment  4×10-9 C m is aligned at 30° with the direction of a uniform electric field of magnitude 5×104 NC-1. The magnitude of the torque acting on the dipole is:
1. 2 × 10−5 N m
2. 10−4 N m
3. 10−5 N m
4. 2 × 10−4 N m

Subtopic:  Electric Dipole |
 80%
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Which of the following statements about electric field lines (due to static charges) is incorrect?

1. electric field lines never cross each other at any point.
2. electric field lines do not form any closed loop.
3. electric field lines can not be taken as continuous curves.
4. electric field lines start from a positive charge and end on a negative charge.

Subtopic:  Electric Field |
 77%
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A polythene piece rubbed with wool is found to have a negative charge of 3×10-7 C. Transfer of mass from wool to polythene is:
1. 0.7 × 10 - 18   kg
2. 1.7 × 10 - 17   kg
3. 0.7 × 10 - 17   kg
4. 1.7 × 10 - 18   kg

Subtopic:  Electric Charge |
 59%
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Two insulated charged copper spheres A and B have their centers separated by a distance of 50 cm. What is the mutual force of electrostatic repulsion if the charge on each is  6.5×10-7 C? The radii of A and B are negligible compared to the distance of separation.
1. 1.52 × 10−2 N
2. 3.7 × 10−2 N
3. 2.01 × 10−2 N
4. 2.23 × 10−1 N

Subtopic:  Coulomb's Law |
 73%
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The figure below shows tracks of three charged particles in a uniform electrostatic field. Which particle has the highest charge to the mass ratio?

1. 2
2. 3
3. 1
4. 1 and 3

Subtopic:  Electric Field |
 63%
From NCERT
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What is the flux of electric field E=3×103 i^ N/C through a square of 10 cm on a side whose plane is parallel to the y z – plane?

1. \(15\ N\ m^{2}/C\)
2.\(10\ N\ m^{2}/C\)
3.\(30 \ N\ m^{2}/C\)
4.0

Subtopic:  Gauss's Law |
 70%
From NCERT
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The electric field at the surface of a black box indicates that the net outward flux through the surface of the box is \(8.0\times10^{3}\) N-m2/C. What is the net charge inside the box?
1. \(1.01\) \(\mu\)C
2. \(0.01\) \(\mu\)C
3. \(0.03\) \(\mu\)C
4. \(0.07\) \(\mu\)C

Subtopic:  Gauss's Law |
 74%
From NCERT
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A point charge + 10 μC is at a distance 5 cm directly above the centre of a square of side 10 cm, as shown in the figure. What is the magnitude of the electric flux through the square?

1. 3.18×105 N m2 C-1

2. 2.10×105 N m2 C-1

3. 1.03×105 N m2 C-1

4. 1.88×105 N m2 C-1

Subtopic:  Gauss's Law |
 58%
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A point charge of 2.0 μC is at the center of a cubic Gaussian surface 9.0 cm on edge. What is the net electric flux through the surface?

1. 2.26 × 105  N  m2 C-1
2. 2.09 × 105  N  m2 C-1
3. 4.33 × 105  N  m2 C-1
4. 4.71 × 105  N  m2 C-1   

  
 

Subtopic:  Gauss's Law |
 63%
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A point charge causes an electric flux of -1.0×103 N m2/C to pass through a spherical Gaussian surface of 10.0 cm radius centered on the charge. If the radius of the Gaussian surface were doubled, how much flux would pass through the surface?

1. - 2.0×103  N m2/ C
2. - 1.0 ×103 N m2/ C
3.  2.0 ×103  N  m2/ C
4.   0

Subtopic:  Gauss's Law |
 78%
From NCERT
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