Eight drops of mercury of equal radii possessing equal charges combine to form a big drop. Then the capacitance of bigger drop compared to each individual small drop is 

(1) 8 times

(2) 4 times

(3) 2 times

(4) 32 times

Subtopic:  Capacitance |
 67%
From NCERT
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A parallel plate condenser has a capacitance 50 μF in air and 110 μF when immersed in an oil. The dielectric constant ‘k’ of the oil is 

(1) 0.45

(2) 0.55

(3) 1.10

(4) 2.20

Subtopic:  Dielectrics in Capacitors |
 78%
From NCERT
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Separation between the plates of a parallel plate capacitor is d and the area of each plate is A. When a slab of material of dielectric constant k and thickness t(t < d) is introduced between the plates, its capacitance becomes -

(1) ε0Ad+t11k

(2) ε0Ad+t1+1k

(3) ε0Ad-t11k

(4) ε0Ad-t1+1k

Subtopic:  Dielectrics in Capacitors |
 64%
From NCERT
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The capacity of parallel plate condenser depends on 

(1) The type of metal used

(2) The thickness of plates

(3) The potential applied across the plates

(4) The separation between the plates

Subtopic:  Capacitance |
 72%
From NCERT
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The capacity of a parallel plate condenser is C. It's capacity when the separation between the plates is halved will be?

(1) 4 C

(2) 2 C

(3) C2

(4) C4

Subtopic:  Capacitance | Energy stored in Capacitor |
 88%
From NCERT
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Eight small drops, each of radius r and having same charge q are combined to form a big drop. The ratio between the potentials of the bigger drop and the smaller drop is 

(1) 8 : 1

(2) 4 : 1

(3) 2 : 1

(4) 1 : 8

Subtopic:  Electric Potential |
 62%
From NCERT
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1000 small water drops each of radius r and charge q coalesce together to form one spherical drop. The potential of the big drop is larger than that of the smaller drop by a factor of 

(1) 1000

(2) 100

(3) 10

(4) 1

Subtopic:  Electric Potential |
 76%
From NCERT
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A parallel plate condenser is immersed in an oil of dielectric constant 2. The field between the plates is 

(1) Increased proportional to 2

(2) Decreased proportional to 12

(3) Increased proportional to 2

(4) Decreased proportional to 12 

Subtopic:  Dielectrics in Capacitors |
 78%
From NCERT
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If the dielectric constant and dielectric strength be denoted by k and x respectively, then a material suitable for use as a dielectric in a capacitor must have:

1. high k and high x.

2. high k and low x.

3. low k and low x.

4. low k and high x.

Subtopic:  Dielectrics in Capacitors |
 56%
From NCERT
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When air in a capacitor is replaced by a medium of dielectric constant K, the capacity -

(1) Decreases K times

(2) Increases K times

(3) Increases K2 times

(4) Remains constant

Subtopic:  Dielectrics in Capacitors |
 87%
From NCERT
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