JEE Questions for Physics Electrostatics Ii Quiz 1 - MCQExams.com

The energy stored in a capacitor of capacitance C having a charge Q under a potential V is

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  • 2)
    Physics-Electrostatics II-73013.png

  • Physics-Electrostatics II-73014.png

  • Physics-Electrostatics II-73015.png

  • Physics-Electrostatics II-73016.png
The capacity of a spherical condenser is 1 μF. If the spacing between the two spheres is 1 mm, the radius of the outer sphere is
  • 3 cm
  • 6 cm
  • 3 m
  • 6 m
In a parallel plate capacitor, the capacity increases, if
  • area of the plate is decreased
  • distance between the plates increases
  • area of the plate is increased
  • dielectric constant decrease
Capacity of a capacitor is 48 μF. When it is charged from 0.1 C to 0.5 C, change in the energy stored is
  • 2500 J
  • 2.5 × 10 -3 J
  • 2.5 × 106 J
  • 2.42 × 10-2 J
The capacitance of an isolated conducting sphere of radius R is proportional to
  • R -1
  • R 2
  • R -2
  • R
A capacitor of capacity 10µF is charged to a potential of 400 V. When its both plates are connected by a conducting wire, then heat generated will be
  • 80 J
  • 0.8 J
  • 8 × 10-3 J
  • 8 × 10-6 J
If dielectric is inserted in charged capacitor (battery removed), then quantity that remains constant is
  • capacitance
  • potential
  • intensity
  • charge
A 500 µF capacitor is charged at a steady rate of 100 µCs -1. The potential difference across the capacitor will be 10 V after an interval of
  • 5 s
  • 25 s
  • 20 s
  • 50 s
A parallel plate air capacitor has a capacitance C. When it is half filled with a dielectric of dielectric constant 5, the percentage increase in the capacitance will be
  • 400%
  • 66.6%
  • 33.3%
  • 200%
The work done in placing a charge of 8 × 10-18 C on a condenser of capacity 100 µF is
  • 16 × 10-32 J
  • 3.1 × 10-26 J
  • 4 × 10-10 J
  • 32 × 10-32 J
27 small drops each having charge q and radius r coalesce to form big drop. How many times charge and capacitance will become?
  • 3, 27
  • 27, 3
  • 27, 27
  • 3, 3
A spherical drop of capacitance 1 µF is broken into eight drops of equal radius. Then, the capacitance of each small drop is

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    Physics-Electrostatics II-73029.png

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Two capacitors each of capacity 2 µF are connected in parallel. If they are connected to 100 V battery, then energy stored in them is
  • 0.02 J
  • 0.04 J
  • 0.01 J
  • 200 J
A dielectric slab is inserted between the plates of an isolated charged capacitor. Which of the following quantities remain unchanged?
  • The charge on the capacitor
  • The stored energy in the capacitor
  • The potential difference between the plates
  • The electric field in the capacitor
If eight similar charge drops combine to form a bigger drop, then the ratio of capacitance of bigger drop to that of smaller drop will be
  • 2 : 1
  • 8 : 1
  • 4 : 1
  • 16 : 1
A capacitor having capacity of 2µF is charged to 200 V and then the plates of the capacitor are connected to a resistance wire. The heat produced in joule will be
  • 2 × 10-2
  • 4 × 10-2
  • 4 × 104
  • 4 × 1010
In this diagram, the PD between A and B is 60 V. The PD across 6µF capacitor is
Physics-Electrostatics II-73035.png
  • 4 V
  • 10 V
  • 5 V
  • 20 V
The equivalent capacitance of the combination shown in figure below is
Physics-Electrostatics II-73037.png
  • 2C
  • C
  • 1/2 C
  • None of these
Minimum number of 8µF and 250 V capacitors are used to make a combination of 16 µF and 1000 V are
  • 4
  • 32
  • 8
  • 3
A capacitor of capacitance 1µF . is filled with two dielectrics of dielectric constants 4 and 6. What is the new capacitance?
Physics-Electrostatics II-73039.png
  • 10 µF
  • 5 µF
  • 4 µF
  • 7 µF
How many 6 µF, 200 V condensers are needed to make a condenser of 18 µF, 600 V?
  • 9
  • 18
  • 3
  • 27
A parallel plate capacitor is made by stacking n equally spaced plates connected alternatively. If the capacitance between any two adjacent plates is C, then the resultant capacitance is
  • ( n -1 ) C
  • ( n +1 ) C
  • C
  • nC
What is the potential difference across 2µF capacitor in the circuit shown?
Physics-Electrostatics II-73042.png
  • 12 V
  • 4 V
  • 6 V
  • 18 V
A parallel plate capacitor is made of two circular plates separated by a distance of 5 mm and with a dielectric of dielectric constant 2.2 between them. When the electric field in the dielectric is 3 × 104 V/ m , the charge density of the positive plate will be close to
  • 6 × 10-7C/m2
  • 3 × 10-7C/m2
  • 3 × 104 C/m2
  • 6 × 104 C/m2
The amount of work done in increasing the voltage across the plates of a capacitor from 5V to 10V is W. The work done in increasing it from 10 V to 5 V will be
  • 0.6 W
  • 1 W
  • 1.25 W
  • 1.67 W
Two capacitors of 10 pF and 20 pF are connected to 200 V and 100 V sources, respectively. If they are connected by the wire, what is the common potential of the capacitors?
  • 133.3 V
  • 150 V
  • 300 V
  • 400 V
A parallel plate capacitor is charged and then disconnected from the charging battery. If the plates are now moved farther apart by pulling at them by means of insulating handles, then
  • the energy stored in the capacitor decreases
  • the capacitance of the capacitor increases
  • the charge on the capacitor decreases
  • the voltage across the capacitor increases
A 15 pF capacitor is connected to a 60 V battery. How much electrostatic energy is stored?
  • 2.70 × 10-8 J
  • 1.77 × 10-8 J
  • 2.35 × 10-8 J
  • 2.0 × 10-8 J
A 2μF capacitor is charged as shown in the figure. The percentage of its stored energy dissipated after the switch s is turned to position 2 is
Physics-Electrostatics II-73049.png
  • 0%
  • 20%
  • 75%
  • 80%
A capacitor of capacitance C is charged to a potential V. The flux of the electric field through a closed surface enclosing the capacitor is

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    Physics-Electrostatics II-73052.png

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