An insulated sphere of radius R has a uniform charge density ρ. The electric field at a distance r from the center of the sphere (r<R) is-

1.  ρ r3 ε0

2.  ρ R3 ε0

3.  ρ rε0

4.  ρε0R

Subtopic:  Electric Field | Gauss's Law |
 68%
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The electric flux from a cube of edge l is ϕ. What will be its value if the edge of the cube is made 2and the charge enclosed is halved?

1.  12ϕ

2.  2ϕ

3.  4ϕ

4.  ϕ

Subtopic:  Gauss's Law |
 69%
From NCERT
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Three identical plates are kept as shown. Plate 1 is given -5Q charge and plate 3 is given Q charge. Electric field intensity at point x is

1.  3QAε0down

2.  3Q2Aε0down

3.  3Q2Aε0upward

4.  3QAε0upward

Subtopic:  Electric Field |
 52%
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The equation of trajectory of a charged particle moving in xy plane in a uniform electric field maybe 

1.  y = 2x + 8

2.  x = y2 + 4

3.  y = 2x2 + 6

4.  All of these

Subtopic:  Electric Field |
 65%
From NCERT
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A short electric dipole having dipole moment pi^ is placed at origin and a point charge +q is placed at point (0, r). The force on dipole due to charge is in:

1.  +x-direction

2.  -x-direction

3.  +y-direction

4.  -y-direction

Subtopic:  Electric Dipole |
From NCERT
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A point charge q is placed at the center of the open face of a hemispherical surface as shown in the figure. The flux linked with the surface is:

       

1.  zero

2.  q2ε0

3.  qε0

4.  qπr2

Subtopic:  Gauss's Law |
 73%
From NCERT
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Order of q/m ratio of the proton, α-particle and electron is

1.  e > p > α

2.  p > α > e

3.  e > α > p

4.  p > e > α

Subtopic:  Electric Charge |
 67%
From NCERT
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A body can be negatively charged by

1.  Giving excess of electrons to it

2.  Removing some electrons from it

3.  Giving some protons to it

4.  Removing some neutrons from it

 

Subtopic:  Electric Charge |
 91%
From NCERT
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An electric field in space is given by 10i^ + 3j^ + 4k^ unit, then electric flux through a surface of area 1 unit lying in yz plane is

1.  10 units

2.  17 units

3.  30 units

4.  40 units

Subtopic:  Gauss's Law |
 83%
From NCERT
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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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