Two small spherical balls each carrying a charge Q = 10 μC (10 micro-coulomb) are suspended by two insulating threads of equal lengths 1m each, from a point fixed in the ceiling. It is found that in equilibrium threads are separated by an angle 60° between them, as shown in the figure. What is the tension in the threads (Given: 1(4πε0)=9×109Nm/C2) 

(1) 18 N

(2) 1.8 N

(3) 0.18 N

(4) None of the above

Subtopic:  Coulomb's Law |
 73%
From NCERT
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An electron having charge \(e\) and mass \(m\) is moving in a uniform electric field \(E.\) Its acceleration will be:
1. \(\frac{e^2}{m}\)
2. \(\frac{E^2e}{m}\)
3. \(\frac{eE}{m}\)
4. \(\frac{mE}{e}\)

Subtopic:  Electric Field |
 90%
From NCERT
AIIMS - 2002
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Infinite charges of magnitude q each are lying at x =1, 2, 4, 8... meter on X-axis. The value of the intensity of the electric field at point x = 0 due to these charges will be 

(1) 12 × 109q N/C

(2) Zero

(3) 6 × 109q N/C

(4) 4 × 109q N/C

Subtopic:  Electric Field |
 67%
From NCERT
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A pendulum bob of mass 30.7×106kg and carrying a charge 2×108C is at rest in a horizontal uniform electric field of 20000 V/m. The tension in the thread of the pendulum is (g=9.8m/s2)

(1) 3×104N

(2) 4×104N

(3) 5×104N

(4) 6×104N 

Subtopic:  Electric Field |
From NCERT
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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-point charges +8q and –2q are located at x = 0 and x = L respectively. The location of a point on the x-axis at which the net electric field due to these two point charges is zero is 

1. 8 L

2. 4 L

3. 2 L

4. L4

Subtopic:  Electric Field |
 72%
From NCERT
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Three infinitely long charge sheets are placed as shown in the figure. The electric field at point P is 

(1) 2σεok^

(2) 2σεok^

(3) 4σεok^

(4) -4σεok^

Subtopic:  Electric Field |
 70%
From NCERT
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Two infinitely long parallel conducting plates having surface charge densities +σ and –σ respectively, are separated by a small distance. The medium between the plates is a vacuum. If ε0 is the dielectric permittivity of vacuum, then the electric field in the region between the plates is 

(1)  0 volts/meter

(2) σ2εovolts/meter

(3) σεovolts/meter

(4) 2σεovolts/meter 

Subtopic:  Electric Field |
 60%
From NCERT
AIIMS - 2005
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Four-point +ve charges of the same magnitude (Q) are placed at four corners of a rigid square frame as shown in the figure. The plane of the frame is perpendicular to Z-axis. If a –ve point charge is placed at a distance z away from the above frame (z<<L) then 

1. – ve charge oscillates along the Z-axis.

2. It moves away from the frame.

3. It moves slowly towards the frame and stays in the plane of the frame.

4. It passes through the frame only once.

Subtopic:  Coulomb's Law |
 59%
From NCERT
AIIMS - 2005
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A cylinder of radius R and length L is placed in a uniform electric field E parallel to the cylinder axis. The total flux for the surface of the cylinder is given by 

(1) 2πR2E

(2) πR2/E

(3) (πR2πR)/E 

(4) Zero

Subtopic:  Gauss's Law |
 71%
From NCERT
PMT - 1975
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