When \(10^{19}\) electrons are removed from a neutral metal plate, the electric charge on it is? 

1. \(-1.6\) C 2. \(+1.6\) C
3. \(10^{19}\) C 4. \(10^{-19}\) C

Subtopic:  Electric Charge |
 70%
From NCERT
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Five balls numbered 1 to 5 are suspended using separate threads. Pairs (1, 2), (2, 4), and (4, 1) show electrostatic attraction, while pairs (2, 3) and (4, 5) show repulsion. Therefore ball 1 must be:

1. positively charged.

2. negatively charged.

3. neutral.

4. made of metal.

Subtopic:  Coulomb's Law |
 68%
From NCERT
PMT - 2003
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Two spherical conductors B and C having equal radii and carrying equal charges in them repel each other with a force F when kept apart at some distance. A third spherical conductor having same radius as that of B but uncharged is brought in contact with B, then brought in contact with C and finally removed away from both. The new force of repulsion between B and C is:

1. F/4

2. 3 F/4

3. F/8

4. 3 F/8

Subtopic:  Coulomb's Law |
 61%
From NCERT
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An infinite number of charges, each of charge 1 μC, are placed on the x-axis with co-ordinates x = 1, 2, 4, 8, ....∞. If a charge of 1 C is kept at the origin, then what is the net force acting on 1 C charge?

1. 9000 N 2. 12000 N
3. 24000 N 4. 36000 N
Subtopic:  Coulomb's Law |
 66%
From NCERT
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Three identical positive point charges, as shown are placed at the vertices of an isosceles right-angled triangle. Which of the numbered vectors coincides in direction with the electric field at the mid-point M of the hypotenuse?
                
1. 1
2. 2
3. 3
4. 4

Subtopic:  Electric Field |
 78%
From NCERT
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An electron enters an electric field with its velocity in the direction of the electric lines of force. Then: 

1. the path of the electron will be a circle. 2. the path of the electron will be a parabola.
3. the velocity of the electron will decrease. 4. the velocity of the electron will increase.

Subtopic:  Electric Field |
 58%
From NCERT
PMT - 2000
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A charged ball B hangs from a silk thread S, which makes an angle θ with a large charged conducting sheet P, as shown in the figure. The surface charge density σ of the sheet is proportional to: 

     

1. sin θ

2. tan θ

3. cos θ

4. cot θ

Subtopic:  Electric Field |
 61%
From NCERT
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Two equal negative charges of charge – q are fixed at the points (0, a) and (0, –a) on the Y-axis. A positive charge Q is released from rest at the point (2a, 0) on the X-axis. The charge Q will:

1. execute simple harmonic motion about the origin.
2. move to the origin and remain at rest.
3. move to infinity.
4. execute oscillatory but not simple harmonic motion.
Subtopic:  Coulomb's Law |
 53%
From NCERT
PMT - 1996
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A point charge q is placed at a distance a/2 directly above the centre of a square of side a. The electric flux through the square (i.e. one face) is:

1. qε0

2. qπε0

3. q4ε0 

4. q6ε0

Subtopic:  Gauss's Law |
 61%
From NCERT
PMT - 1997
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An infinite number of electric charges each equal to 5 nC (magnitude) are placed along the x-axis at x = 1 cm, x = 2 cm, x = 4 cm, x = 8 cm ………. and so on. In the setup if the consecutive charges have opposite sign, then the electric field in Newton/Coulomb at x = 0 is: 14πε0=9×10Nm2/C2

1. 12 × 104

2. 24 × 104

3. 36 × 104

4. 48 × 104

Subtopic:  Electric Field |
 56%
From NCERT
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