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Class 12 Physics
Electric Charges And Fields
Quiz 2
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A semicircular arc of radius r is charged uniformly and the charge per unit length is λ. The electric field at the centre is:
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\(\frac{λ}{2λε_0r^2}\)
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\(\frac{λ}{4πε_0r}\)
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\(\frac{λ^2}{2πε_0r}\)
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\(\frac{λ}{2πε_0r}\)
Explanation
\(\frac{λ}{4πε_0r}\)
When a dipole of moment \(\vec{p}\) is placed in uniform electric field \(\vec{E}\), then the torque acting on the dipole is:
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\(\vec{τ}\) = \(\vec{p}\).\(\vec{E}\)
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\(\vec{τ}\) = \(\vec{P}\) + \(\vec{E}\)
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\(\vec{τ}\) = \(\vec{p}\) + \(\vec{E}\)
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\(\vec{τ}\) = \(\vec{p}\) - \(\vec{E}\)
Explanation
\(\vec{τ}\) = \(\vec{p}\) + \(\vec{E}\)
Two point charges +8q and -2q are located at ,v = O and ,v = L respectively. The location of a point on the .v-axis at which the net electric field due to these two point charges b is zero :
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4L
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8L
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L/4
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2L
Explanation
2L
The graph drawn between V are r for a non-conducting charged solid sphere of radius R for r < R will be :
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straight line
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parabola
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hyperbola
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None of these
Explanation
None of these
Corona discharge takes place:
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at the surface of a conductor
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near the sharp points of a conductor
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outside the conductor
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at the centre of the conductor
Explanation
near the sharp points of a conductor
The belt of a Vande Graaf generator gets charge by :
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corona discharge
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induction
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electrification
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None of these
Explanation
corona discharge
The conservation of electric charge implies that:
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Charge can't be created
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Charge can't be destroyed
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The number of charged particle in the universe is constant
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Simultaneous creation of equal and opposite charges is permissible
Explanation
Simultaneous creation of equal and opposite charges is permissible
The number of electrons contained in one coulomb of charge is:
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6.25 × 10
18
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6.25 × 10
17
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6.25 × 10
19
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1.6 × 10
19
Explanation
6.25 × 10
18
The unit of intensity of electric field is :
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metre/volt
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Joule/newton
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Coulomb/newton
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Newton/coulomb
Explanation
metre/volt
1 V equals to:
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1 J
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1 JC
-1
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1 CJ
-1
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1 JC
Explanation
1 JC
-1
1 V m
-1
equals to:
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1 N
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1 Mm
-1
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1 NC
-1
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1 J
-1
Explanation
1 NC
-1
The minimum amount of charge observed so far is:
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1 C
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4.8 × 1
-13
C
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1.6 × 10
-19
C
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1.6 × 10
19
C
Explanation
1.6 × 10
-19
C
The ratio of electric force between two electrons to the gravitational force between them is of the order:
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10
42
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10
39
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10
36
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1
Explanation
10
42
0 h : 0 m : 1 s
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