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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The capacity of a parallel plate capacitor increases with the 

(1) Decrease of its area

(2) Increase of its distance

(3) Increase of its area

(4) None of the above

Subtopic:  Capacitance |
 86%
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The radii of two metallic spheres P and Q are r1 and r2 respectively. They are given the same charge. If r1 > r2  , then on connecting them with a thin wire, the charge will flow 

(1) From P to Q

(2) From Q to P

(3) Neither the charge will flow from P to Q nor from Q to P

(4) The information is incomplete

Subtopic:  Electric Potential |
From NCERT
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Between the plates of a parallel plate condenser, a plate of thickness t1 and dielectric constant k1 is placed. In the rest of the space, there is another plate of thickness t2 and dielectric constant k2. The potential difference across the condenser will be 

(1) QAε0t1k1+t2k2

(2) ε0QAt1k1+t2k2

(3) QAε0k1t1+k2t2

(4) ε0QA(k1t1+k2t2)

Subtopic:  Dielectrics in Capacitors |
 67%
From NCERT
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The true statement is, on increasing the distance between the plates of a parallel plate condenser -

(1) The electric intensity between the plates will decrease

(2) The electric intensity between the plates will increase

(3) The electric intensity between the plates will remain unchanged

(4) The P.D. between the plates will decrease

Subtopic:  Capacitance |
 51%
From NCERT
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The capacity and the energy stored in a parallel plate condenser with air between its plates are respectively Co and Wo. If the air is replaced by the glass (dielectric constant = 5) between the plates, the capacity of the condenser and the energy stored in it will respectively be -

(1) 5Co,5Wo

(2) 5Co,W05

(3) Co5,5Wo

(4) Co5,Wo5

Subtopic:  Dielectrics in Capacitors |
 71%
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Force of attraction between the plates of a parallel plate capacitor whose dielectric constant is K will be -

(1) q22ε0AK

(2) q2ε0AK

(3) q2ε0A

(4) q22ε0A2K

Subtopic:  Dielectrics in Capacitors |
 68%
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A 6 μF capacitor is charged from 10 volts to 20 volts. Increase in energy will be 

(1) 18 × 10–4 J

(2) 9 × 10–4 J

(3) 4.5 × 10–4 J

(4) 9 × 10–6 J

Subtopic:  Energy stored in Capacitor |
 83%
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Twenty seven drops of water of the same size are equally and similarly charged. They are then united to form a bigger drop. By what factor will the electrical potential changes 

(1) 9 times

(2) 27 times

(3) 6 times

(4) 3 times

Subtopic:  Electric Potential |
 72%
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