Practice Test 3 - ePrepare Academy

Electrostatic Practice Test 3 (ORG)

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1. The electric field required to keep a water drop of mass m just to remain suspended, when charged with one electron is

A) em/g

B) mg/e

C) emg

D) mg

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2. The capacitors of capacitance 4 μF and 6 μF are connected in series. A potential difference of500 volt is applied to the outer plates of two capacitor system. Then the charge on each plate of each capacitor is numerically

A) 6000 μC

B) 1200 μC

C) l2000 μC

D) 60000 μC

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3. When we touch the terminal of a high voltage capacitor, even after a high voltage has been cut off. Then the capacitor has the tendency to

A) affect dangerously

B) discharge energy

C) restore energy

D) both (a) and (b)

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4. he study of the effect associated with electric field at rest is known as

A) electrostatics

B) electromagnetism

C) magneto static

D) none of these

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5. Three capacitors of 2.0, 3.0. and 6.0 μF connected in series to a 10 V source. The charge on 3.0 μ F capacitor is

A) 15μC

B) 12μC

C) 5 μ C

D) 10 μ C

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6.

Two charges of Q coulombs are a distance d apart from each other. Which of the following would reduce the force exerted between the charges by a factor of 4?

A) Decrease the each charge Q by a factor of four.

B) Increase distance D by a factor of 4.

C) Increase distance D by a factor of two.

D) Decrease distance D by a factor of two.

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7.

Which of the following is not true regarding electric potential?

A) The positive terminal of a battery has higher electric potential than the negative terminal

B) Electric potential can be expressed with units of Volts or Joules per Coulomb

C) A negative charge moving from low potential to high potential will accelerate

D) When a positive charge moves from a region of low potential to high potential, the electric field does positive work on the charge

E) All of these are true statements

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8.

If the electrical potential energy between two equal charges quadruples, describe the change in the distance between the particles.

A) The distance was halved

B) The distance was not changed

C) The distance was quadrupled

D) The distance was quartered

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9. The potential taken between two points across a resistor will be

A) Positive

B) Negative

C) Infinity

D) Zero

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10. A capacitor consists of_________

A) Two conductors

B) Two semiconductors

C) Two dielectrics

D) Two insulators

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11. For very low frequencies, capacitor acts as ________

A) Open circuit

B) Short circuit

C) Amplifier

D) Rectifier

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12. For high frequencies, capacitor acts as _________

A) Open circuit

B) Short circuit

C) Amplifier

D) Amplifier

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13. If 2V is supplied to a 3F capacitor, calculate the charge stored in the capacitor.

A) 1.5C

B) 6C

C) 3C

D) 3C

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14. What is the relation between current and voltage in a capacitor?

A) I=1/C*∫Vdt)

B) I=CdV/dt

C) I=1/CdV/dt

D) I=Ct

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15. A capacitor is charged to a voltage of 400V and has a resistance of 20ohm. Calculate the final value of charging current.

A) 10A

B) 0A

C) Infinity

D) 20A

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16. What happens to the capacitor when the capacitor voltage is equal to the source voltage?

A) The charging phase of the capacitor is over

B) The discharging phase of the capacitor is over

C) The capacitor is switched off

D) The capacitor is switched on

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17. When will be capacitors fully charged?

A) When voltage is zero

B) When the supply voltage is equal to the capacitor voltage

C) When voltage is infinity

D) When capacitor voltage is equal to half the supply voltage

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18. A capacitor is charged to a voltage of 400V and has a resistance of 20ohm. Calculate the final value of the discharge current.

A) 10A

B) 0A

C) Infinity

D) 20A

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19. A capacitor is charged to a voltage of 400V and has a resistance of 20ohm. Calculate the initial value of the discharge current.

A) 10A

B) 0A

C) Infinity

D) 20A

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20. Two point charges +4 mC and -1 mC are separated by a distance of d. The ratio of force acting on them will be

A) 4:1

B) 1:4

C) 2:1

D) 1:1

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21. A capacitor is charged to a voltage of 400V and has a resistance of 20ohm. Calculate the initial value of charging current.

A) 10A

B) 0A

C) Infinity

D) 20A

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22. What is the final current while charging a capacitor?

A) High

B) Zero

C) Infinity

D) Low

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23. What is the initial current while charging a capacitor?

A) High

B) Low

C) 0

D) Cannot be determined

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24. Which of the following depends on charging and discharging rate of a capacitor?

A) Time constant

B) Current

C) Power

D) Voltage

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25. a point charge Q_{1 =}-9 microcoloumbis at x=0 while Q₂=4microcoloumbis at x=1m . at what point would the net force on a positive charge Q_{3 be 0?}

A) 3m

B) 6m

C) 7m

D) 9m

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26. To obtain 3 mF capacity from three capacitors of 2 mF each,
they will be arranged.

A) all the three in series

B) all the three in parallel

C) two capacitors in series and the third in parallel with the combinatioin of first two

D) two capacitors in parallel and the third in series with the combinatioin of first two

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27. What is the total capacitance when two capacitors C1 and C2 are connected in series?

A) (C1+C2)/C1C2

B) 1/C1+1/C2

C) C1C2/(C1+C2)

D) C1+C2

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28. In a charged capacitor, the energy resides

A) in the positive charges

B) in both the positive and negative charges

C) in the field between the plates.

D) around the edges of the capacitor plates

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29. The potential gradient at which the dielectric of a condenser just gets punctured is called

A) dielectric constant

B) dielectric strength

C) dielectric resistance

D) dielectric number

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30. A sheet of aluminum foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

A) decreases

B) remains unchanged

C) becomes infinite

D) increases

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31. The work done in placing a charge of 8 × 10^–18 coulomb on
a condenser of capacity 100 micro-farad is

A) 3.1 × 10^–26 joule

B) 4 × 10–^10 joule

C) 32 × 10^–32 joule

D) 16 × 10^–232 joule

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32. Capacitors are used in electrical circuits where appliances
need more

A) voltage

B) current

C) resistance

D) power

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33. The energy stored in a condenser of capacity C which
has been raised to a potential V is given by

A) = 1/2 CV

B) = 1/2 CV^2

C) u = CV

D) none

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34. A conductor carries a certain charge. When it is connected
to another uncharged conductor of finite capacity, then the
energy of the combined system is

A) more than that of the first conductor

B) less than that of the first conductor

C) equal to that of the first conductor

D) uncertain

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35. When air in a capacitor is replaced by a medium of
dielectric constant K, the capacity

A) decreases K times

B) increases K times

C) increases K^2 times

D) remains constant

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36. If in a parallel plate capacitor, which is connected to a battery,
we fill dielectrics in whole space of its plates, then which of
the following increases?

A) Q and V

B) V and E

C) E and C

D) Q and C

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37. Energy is stored in a capacitor in the form of

A) electrostatic energy

B) magnetic energy

C) light energy

D) heat energy

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38. On decreasing the distance between the plates of a parallel
plate capacitor, its capacitance

A) remains unaffected

B) decreases

C) first increases then decreases

D) increases

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39. If a unit positive charge is taken from one point to another
over an equipotential surface, then

A) work is done on the charge

B) work is done by the charge

C) work done is constant

D) no work is done

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40. Which of the following about potential difference between
any two points is true?
I. It depends only on the initial and final position.
II. It is the work done per unit positive charge in moving
from one point to other.
III. It is more for a positive charge of two units as compared
to a positive charge of one unit

A) I only

B) II only

C) I and II

D) I, II and III

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