The dielectric constant k of an insulator cannot be 

(1) 3

(2) 6

(3) 8

(4) ∞

Subtopic:  Dielectrics in Capacitors |
 94%
From NCERT
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A parallel plate capacitor is charged and the charging battery is then disconnected. If the plates of the capacitor are moved further apart by means of insulating handles, then 

(1) The charge on the capacitor increases

(2) The voltage across the plates decreases

(3) The capacitance increases

(4) The electrostatic energy stored in the capacitor increases

Subtopic:  Energy stored in Capacitor |
 60%
From NCERT
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A spherical condenser has inner and outer spheres of radii a and b respectively. The space between the two is filled with air. The difference between the capacities of two condensers formed when outer sphere is earthed and when inner sphere is earthed respectively will be 

(1) Zero

(2) 4πε0a

(3) 4πε0b

(4) 4πε0abba

Subtopic:  Combination of Capacitors |
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The intensity of electric field at a point between the plates of a charged capacitor 

(1) Is directly proportional to the distance between the plates

(2) Is inversely proportional to the distance between the plates

(3) Is inversely proportional to the square of the distance between the plates

(4) Does not depend upon the distance between the plates

Subtopic:  Capacitance |
 68%
From NCERT
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In a spherical condenser radius of the outer sphere is R. The difference in the radii of the outer and inner sphere is x. Its capacity is proportional to

(1) xR(Rx)

(2) x(Rx)r

(3) R(Rx)x

(4) Rx

Subtopic:  Capacitance |
 59%
From NCERT
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A capacitor, when filled with a dielectric K = 3, has charge Q0, voltage V0 and field E0. If the dielectric is replaced with another one having K = 9 the new values of charge, voltage and field will be respectively, when the capacitor is not connected with a battery -

(1) 3Q0,3V0,3E0

(2) Q0,3V0,3E0

(3) Q0,V03,3E0

(4) Q0,V03,E03

Subtopic:  Dielectrics in Capacitors |
 75%
From NCERT
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A parallel plate condenser with oil between the plates (dielectric constant of oil K = 2) has a capacitance C. If the oil is removed, then capacitance of the capacitor becomes 

(1) 2C

(2) 2C

(3) C2

(4) C2

Subtopic:  Dielectrics in Capacitors |
 81%
From NCERT
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Two identical charged spherical drops each of capacitance C merge to form a single drop. The resultant capacitance is -

(1) Equal to 2C

(2) Greater than 2C

(3) Less than 2C but greater than C

(4) Less than C

Subtopic:  Capacitance |
 63%
From NCERT
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A 12pF capacitor is connected to a 50V battery. How much electrostatic energy is stored in the capacitor ?

(1) 1.5 × 10–8 Joule

(2) 2.5 × 10–7 Joule

(3) 3.5 × 10–5 Joule

(4) 4.5 × 10–2 Joule

Subtopic:  Energy stored in Capacitor |
 89%
From NCERT
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The capacity of a parallel plate condenser is 15 μF, when the distance between its plates is 6 cm. If the distance between the plates is reduced to 2 cm, then the capacity of this parallel plate condenser will be?

(1) 15 μF

(2) 30 μF

(3) 45 μF

(4) 60 μF

Subtopic:  Capacitance |
 85%
From NCERT
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