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JEE Questions for Physics Electrostatics Ii Quiz 4 - MCQExams.com
JEE
Physics
Electrostatics Ii
Quiz 4
An electron enters the space between the plates of a charged capacitor as shown. The charge density on the plate is σ, electric intensity in the space between the plates is
E
. A uniform magnetic field
B
also exists in the space perpendicular to the direction of E. The electron moves perpendicular to both
E
and
B
without any change in direction. The time taken by the electron to travel a distance
l
in the space is
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A parallel plate capacitor having air as dielectric medium is charged by a potential difference of V volt. After disconnecting the battery, the distance between the plates of the capacitor is increased using an insulated handle. As a result, potential difference between the plates
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increases
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does not change
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becomes zero
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decreases
The capacitance of a parallel plate capacitor with air as medium is 3 µF. With the introduction of a dielectric medium between the plates, the capacitance becomes 15 µF. The permittivity of the medium is
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5 C2 N -1 m -2
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15 C2 N -1 m -2
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0.44 × 10 -10 C2 N -1 m -2
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8.854 × 10 -11 C2 N -1 m -2
A parallel plate condenser with a dielectric of dielectric constant
K
between the plates has a capacity
C
and is charged to a potential
V
volt. The dielectric slab is slowly removed from between the plates and then reinserted. The net work done by the system in this process is
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The plates of a parallel plate capacitor with air as medium are separated by a distance of 8 mm. A medium of dielectric constant 2 and thickness 4 mm having the same area is introduced between the plates. For the capacitance to remain the same, the distance between the plates is
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8 mm
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6 mm
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4 mm
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12 mm
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10 mm
A parallel plate capacitor has a dielectric slab of dielectric constant
K
between its plates that covers 1/3 of the area of its plates, as shown in the figure. The total capacitance of the capacitor is
C
while that of the portion with dielectric in between is
C
1
. When the capacitor is charged, the plate area covered by the dielectric gets charge
Q
1
and the rest of the area gets charge
Q
2
. The electric field in the dielectric is
E
1
and that in the other portion is
E
2
. Choose the correct option/options, ignoring edge effects.
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In the circuit shown in the figure, there are two parallel plate capacitors each of capacitance C. The switch S
1
is pressed first to fully charge the capacitor C
1
and then released. The switch S
2
is then pressed to charge the capacitor C
2
. After sometime, S
2
is released and then S
3
is pressed. After sometime,
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the charge on the upper plate of C1 is 2 CV0
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the charge on the upper plate of C1 is CV0
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the charge on the upper plate of C2 is 0
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the charge on the upper plate of C2 is –CV0
In the given network, the value of C, so that an equivalent capacitance between A and B is 3 µF, is
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36 µF
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48 µF
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31/5 µF
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1/5 µF
A gang capacitor is formed by interlocking a number of plates as shown in figure. The distance between the consecutive plates is 0.885 cm and the overlapping area of the plates is 5 cm
2
. The capacity of the unit is
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1.06 pF
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4 pF
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6.36 pF
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12.72 pF
A network of six identical capacitors, each of value
C
, is made as shown in the figure. The equivalent capacitance between the points
A
and
B
is
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Effective capacitance between points A and B in the figure, shown is
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The equivalent capacitance between the points A and B in the following circuit is
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1 μF
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2 μF
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4 μF
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8 μF
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The protonic charge in 100 gm of water is .......... c
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The rate of alpha particle falls on neutral sphere is 10
12
per second. The time in which sphere gets charged by 2c is ......... sec.
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2.25
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3.15
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6.25
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1.66
A charge Q is divided into two parts and then they are placed at a fixed distance. The force between the two charges is always maximum when the charges are .........
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Two point charges repel each other with a force of 100 N. One of the charges is increased by 10% and other is reduced by 10%. The new force of repulsion at the same distance would be ........ N.
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121
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100
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99
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89
Given that q
1
+ q
2
= q if the between q
1
and q
2
is maximum, q
1
/q……..
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1
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0.75
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0.25
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0.5
Two small conducting sphere of equal radius have charges +1c and – 2c respectively and placed at a distance d from each other experience force F
1
. If they are brought in contact and separated to the same distance, they experience force F
2
. The ratio of F
1
to F
2
is ………
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–8 : 1
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1 : 2
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1 : 8
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–2 : 1
Three charges, each of value Q, are placed at the vertex of an equilateral triangle. A fourth charge q is placed at the centre of the triangle. If the charges remains stationery then, q = ...............
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Two equal negative charges –q are fixed at points (o, a) and (o, –a). A positive charge Q is released from rest at the point (2a, o) on the X - axis. The charge Q will ..........
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Move to the origin and remain at rest there
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Execute simple harmonic motion about the origin
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Move to infinity
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Execute oscillations but not simple harmonic motion
Four charges, each equal to –Q, are placed at the corners of a square and a charge +q is placed at its centre. If the system is in equilibrium, the value of q is .........
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For the system shown in figure, if the resultant force on q is zero, then Q = ...............
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Two point positive charges q each are placed at (–a, o) and (a, o). A third positive charge q
o
is placed at (o, y). For which value of y the force at q
o
is maximum .........
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a
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2a
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Two identical charged spheres suspended from a common point by two massless strings of Length l are initially a distance d (d << l ) apart because of their mutual repulsion. The charge begins to leak from both the spheres at a constant rate. As a result the spheres approach each other with a velocity ν. Then function of distance x between them becomes ...........
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Three identical spheres each having a charge q and radius R, are kept in such a way that each touches the other two spheres. The magnitude of the electric force on any sphere due to other two is ...........
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Two equal negative charges –q are fixed at points (o, a) and (o, –a) on the Y axis. A positive charge q is released from rest at the point x (x < < a) on the X-axis, then the frequency of motion is .........
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