When a positive charge inside a metallic shell of thickness t is moved, then induced surface charge density

1 On inner surface will same and on the outer surface will change

2 On inner surface will change and on the outer surface will same

3 On the inner and outer surface will the same

4 On the inner and outer surface will change

Subtopic:  Coulomb's Law |
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Charge distribution at three vertices of an equilateral of side is shown in the figure. The net electric dipole moment of the system is

1.  23qaj^

2.  -23qaj^

3.  23qaj^+23qaj^

4.  -23qaj^-23qaj^

Subtopic:  Electric Dipole |
 66%
From NCERT
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A circular plate subtends a solid angle π steradian at a point where a point charge 2Q is kept. The total electric flux through the circular plate is

1Q4ε0

Q2ε0

2Q3ε0

2Qε0

Subtopic:  Gauss's Law |
 53%
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A uniform electric field of strength E exists in a region. An electron is projected in the region perpendicularly with speed v as shown in the diagram. electron exits at point B. The electric field in the region is given by 

E=2xmv2ey2i^

E=xmv2ey2i^

E=-xmv2ey2i^

E=-2xmv2ey2i^

Subtopic:  Electric Field |
From NCERT
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A point charge is placed at the center of the spherical Gaussian surface. The electric flux through the surface is changed if the:

1. sphere is replaced by a cube of the same volume.
2. sphere is replaced by a cube of half volume.
3. charge is moved off-centre in the original sphere.
4. charge is moved just outside the original sphere.

Subtopic:  Gauss's Law |
 80%
From NCERT
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In a region, volume charge density varies with radial distance r as p=Kr where K is positive constant. The electric field E Varies with the radial distance in the region as

1. Er

2. E1r2

3. Er2

4. Er0

Subtopic:  Electric Field |
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Which of the following is incorrect about electrostatic force?

1 it is conservative

2 it is a central force

3 Electrostatic field line never intersect

4 it also depends on the mass content of the body

 

Subtopic:  Coulomb's Law |
 85%
From NCERT
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Two charges each equal to nq(n-1<3) are placed at the corners of an equilateral triangle of side a. The electric field at the third corner is E3, where E0=q4πε0a2 is-

E3=E0

E3<E0

E3>E0

E3E0

Subtopic:  Electric Field |
 59%
From NCERT
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Given below are two statements: 

Statement I: The mass of a body is increased slightly when it is negatively charged.
Statement II: Charging is due to the transfer of electrons.
 
1. Statement I is false but Statement II is true.
2. Both Statement I and Statement II are true.
3. Both Statement I and Statement II are false.
4. Statement I is true but Statement II is false.
Subtopic:  Electric Charge |
From NCERT
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Given below are two statements: 

Statement I: A positive point charge initially at rest in a uniform electric field starts moving along electric lines of forces.
Statement II: A point charge released from rest in an electric field moves along the lines of forces.
 
1. Statement I is false but Statement II is true.
2. Both Statement I and Statement II are true.
3. Both Statement I and Statement II are false.
4. Statement I is true but Statement II is false.
Subtopic:  Electric Field |
From NCERT
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