JEE Questions for Physics Electrostatics Ii Quiz 7 - MCQExams.com

If identical charges (–q) are placed at each corner of a cube of side b, then electric potential energy of charge (+q) which is placed at centre of the cube will be .....

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    Physics-Electrostatics II-73539.png

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A simple pendulum of period T has a metal bob which is negatively charged. If it is allowed to oscillate above a positively charged metal plate, its period will ........
  • Remains equal to T
  • Less than T
  • Infinite
  • Greater than T
A charged particle of mass m and charge q is released from rest in a uniform electric field E. Neglecting the effect of gravity, the kinetic energy of the charged particle after ‘t’ second is ......

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    Physics-Electrostatics II-73545.png

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A thin spherical conducting shell of radius R has a charge q. Another charge Q is placed at the centre of the shell. The electrostatic potential at a point p a distance R/2 from the centre of the shell is .....

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    Physics-Electrostatics II-73550.png

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Two point charges –q and +q are located at points (o, o, –a) and (o, o, a) respectively. The potential at a point (o, o, z) where z > a is ......

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  • 2)
    Physics-Electrostatics II-73555.png

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  • Physics-Electrostatics II-73557.png

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  • 2)
    Physics-Electrostatics II-73561.png

  • Physics-Electrostatics II-73562.png

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Two thin wire rings each having a radius R are placed at a distance d apart with their axes coinciding. The charges on the two rings are +q and –q. The potential difference between the centres of the two rings is ....
  • 0
  • 2)
    Physics-Electrostatics II-73565.png

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  • Physics-Electrostatics II-73567.png

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  • 2)
    Physics-Electrostatics II-73571.png

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  • Physics-Electrostatics II-73573.png

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  • 55 KV
  • 63 KV
  • 49 KV
  • 45 KV
Charges +q and –q are placed at point A and B respectively which are a distance 2L apart, C is the midpoint between A and B. The work done in moving a charge +Q along the semicircle CRD is .......
Physics-Electrostatics II-73576.png

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    Physics-Electrostatics II-73578.png

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N identical drops of mercury are charged simultaneously to 10 volt. when combined to form one large drop, the potential is found to be 40 volt, the value of N is ......
  • 4
  • 6
  • 8
  • 10
Two parallel plate air capacitors have their plate areas 100 and 500 cm2 respectively. If they have the same charge and potential and the distance between the plates of the first capacitor is 9.5 mm, what is the distance between the plates of the second capacitor ?
  • 0.25 cm
  • 0.50 cm
  • 0.75 cm
  • 1 cm
The effective capacitances of two capacitors are 3F and 16F , when they are connected in series and parallel respectively. The capacitance of each capacitor is
  • 2F,14F
  • 4F,12F
  • 6F, 8F
  • 10F, 6F
An electrical technician requires a capacitance of 2F in a circuit across a potential difference of 1KV. A large number of 1F capacitors are available to him, each of which can withstand a potential difference of not than 400 V. suggest a possible arrangement that requires a minimum number of capacitors.
  • 2 rows with 2 capacitors
  • 4 rows with 2 capacitors
  • 3 rows with 4 capacitors
  • 6 rows with 3 capacitors
Two spherical conductors of radii r1 and r2 are at potentials V1 and V2 respectively, then what will be the common potential when the conductors are brought in constant ?

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    Physics-Electrostatics II-73587.png

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  • None of these
A 5F capacitor is charged by a 220 V supply. It is then disconnected from the supply and is connected to another uncharged 2.5F capacitor. How much electrostatic energy of the first capacitor is lost in the form of heat and electromagnetic radiation ?
  • 0.02 J
  • 0.121 J
  • 0.04 J
  • 0.081 J
Find the equivalent capacitance of the system across the terminals A and B. All the capacitors have equal capacitances.
Physics-Electrostatics II-73591.png
  • 2C
  • 4C
  • 3C
  • 5C
Capacitance of a parallel plate capacitor becomes 4/3 times its original value if a dielectric slab of thickness t = d/2 is inserted between the plates (d is the separation between the plates). The dielectric constant of the slab is
  • 8
  • 4
  • 6
  • 2
The plates of a parallel capacitor are charged up to 100 V. If 2 mm thick plate is inserted between the plates, then to maintain the same potential difference, the distance between the capacitor plates is increased by 1.6mm the dielectric constant of the plate is
  • 5
  • 4
  • 1.25
  • 2.5
A parallel plate air capacitor has a capacitance 18F. If the distance between the plates is tripled and a dielectric medium is introduced, the capacitance becomes 72F. The dielectric constant of the medium is
  • 4
  • 12
  • 9
  • 2
Taking earth to be a metallic spheres, its capacity will approximately be

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  • 700 F
  • 711 F
  • 700 pF

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    Physics-Electrostatics II-73599.png

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For the circuit shown in figure the charge on 4F capacitor is
Physics-Electrostatics II-73603.png
  • 20 c
  • 40 c
  • 30 c
  • 54 c
The capacitors of capacitance 4F, 6F and 12F are connected first in series and then in parallel. What is the ratio of equivalent capacitance in the two cases ?
  • 2 : 3
  • 11 : 1
  • 1 : 11
  • 1 : 3
Large number of capactors of rating 10F/200V V are available. The minimum number of capacitors required to design a 10F/700V capacitor is
  • 16
  • 8
  • 4
  • 7
A variable condenser is permanently connected to a 100 V battery. If capacitor is changed from 2F to 10F . then energy changes is equal to

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    Physics-Electrostatics II-73607.png

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Two positive point charges of 12c and 8c are placed 10 cm apart in air. The work done to bring them 4 cm closer is
  • Zero
  • 4.8 J
  • 3.5 J
  • 5.8 J
1000 similar electrified rain drops merge together into one drop so that their total charge remains unchanged. How is the electric energy affected ?
  • 100 times
  • 200 times
  • 400 times
  • 102 times
There are 10 condensers each of capacity 5F. The ratio between maximum and minimum capacities obtained from these condensers will be
  • 40 : 1
  • 25 : 5
  • 60 : 3
  • 100 : 1
A parallel plate capacitor is made by stocking n equally spaced plates connected alternately. If the capacitance between any two plates is x, then the total capacitance is,
  • nx
  • 2)
    Physics-Electrostatics II-73614.png

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0:0:1


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