.The electric field intensity in between the parallel plates of a capacitor is
1.?/2?o
2.Q/2A?o
3.V/d
4.Vd
1 pF is equal to
1.10-6 F
2.10-12 F
3.10-3 F
4.10-9 F
Capacitor stores
1.magnetic energy
2.chemical energy
3.electrical energy
4.heat energy
Electrical charges can be stored in
1.transformers
2.capacitors
3.inductors
4.resistors
If a negatively charged conductor is brought near a positively charged conductor its potential
1.increases
2.decreases
3.remains the same
4.becomes zero
In parallel combination of capacitors
1.charges on the capacitors are same
2.potential difference across each capacitor is same
3.current on the capacitors is same
4.both charges end potentials are same
One microfarad is equal to
1.10-5 F
2.10-3 F
3.10-9 F
4.10-6 F
Pick out the correct formula connecting capacity C voltage V and the charge Q
1.C = V/Q
2.C = Q/V
3.C = VQ
4.C = QV
The area of each plate of a parallel plate capacitor is 4 ? 10-2m2. If the thickness of the dielectric placed in between the plates is 10-3 and the relative permittivity of the dielectric is 7 then the capacitance of the capacitor
1.2.478 ? 10-9F
2.0.2478 ? 10-9F
3.2.478 ? 10+9F
4.2.478 F
The capacitance of a capacitor when the distance between the two plates is doubled
1.reduce to zero
2.is doubled
3.remains the same
4.is halved
The capacitance of a parallel plate capacitor is
1.A?r/d
2.Ad/ ?o ?r
3.A ?o ?r/d
4.d/ A ?o ?r
The capacitance of a parallel plate capacitor is 2�F.If the surface area of the palte is doubled and the distance between the plates is halved what will be the capacitance of the condensor
1.6 �F
2.2 �F
3.8 �F
4.1 �F
The charge that can be stored in a 50�F capacitor connected to a source of potential difference of 20V is
1.1 �C
2.10-3 C
3.1 C
4.1000 C
The dielectric inside a capacitor basically increases
1.voltage rating
2.current rating
3.capacitance
4.power rating
The potential difference between the plates of a 20�F capacitor with a charge of 0.01 coulomb is
1.2 ? 10-7 volts
2.2 ? 10-5 volts
3.50 volts
4.500 volts
The ratio of the charge to potential is
1.resistance
2.current
3.temperature co-efficient of resistance
4.capacitance
The unit of capacitance is
1.coulomb
2.joule
3.volt
4.farad
Two capacitors of capacitance 10�F and 40�F when connected in series will yield an equivalent capacitance of
1.50 �F
2.25 �F
3.8 �F
4.30 �F
When a glass is introduced in between the plates of a parallel plate air condenser its capacitance will
1.not charge
2.decrease
3.increase
4.tend to zero
When the charging source is disconnected the charges given to the plates of an ideal capacitor
1.increases
2.decreases
3.becomes zero
4.remains the same
When two capacitors of capacitances 2 pF and 6 pF connected in parallel the effective capacitance is
1.8 pF
2.12 pF
3.3/2 pF
4.4 pF