Electrostatic Potential and Capacitance Test

Result

Electrostatic Potential and Capacitance Test - 10

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Question 1
4 / -1

Van de Graaff generator is used to

A
store electrical energy

B
build up high voltage of few million volts

C
decelerate charged particle like electrons

D
both (a) and (b) are correct

Solution

Van de Graff generator- is an electrostatic generator which is devised to produce very high voltage by means of an endless belt collecting electrostatic charge from a source and transferring it to a large isolated metal sphere on which a large change accumulates.
Question 2
4 / -1

Which of the following statements is/are true about the principle of Van de Graaff generator?

A
The action of sharp points.

B
The charge given to a hollow conductor is transferred to outer surface and is distributed uniformly over it.

C
It is used for accelerating uncharged particle.

D
Both(a) and (b) are true.

Solution

Van de Graff generator- is an electrostatic generator which is devised to produce very high voltage by means of an endless belt collecting electrostatic charge from a source and transferring it to a large isolated metal sphere on which a large change accumulates.
Question 3
4 / -1

Who established the fact of animal electricity?

A
Van de Graaff

B
Count Alessandro Volta

C
Gustav Robert Kirchhoff

D
Hans Christian Oersted

Solution

The Italian physicist, professor at Pavia, Count Alessandro Volta established that the animal electricity observed by Luigi Galvani in experiments with frog muscle tissue placed in contact with dissimilar metals, was not due to any exceptional property of animal tissues but was also generated whenever any wet body was sandwitched between dissimilar metals.
Question 4
4 / -1

In case of a Van de Graaff generator, the breakdown field of air is

A
2 × 10⁸V m⁻¹

B
3 × 10⁶V m⁻¹

C
2 × 10⁻⁸V m⁻¹

D
3 × 10⁴V m⁻¹

Solution

Although air is normally an insulator but at a sufficient high voltage, it ionises and become partially conducting.
The electric field at which it occurs is called breakdown field of air and is nearly equal to 3 × 10⁶V/m^-1
Question 5
4 / -1

In a Van de Graaff type generator, a spherical metal shell is to be 15 × 10⁶ V electrode. The dielectric strength of the gas surrounding the electrode is 5 × 10⁷Vm⁻¹. The minimum radius of the spherical shell required is

A
1 m

B
2 m

C
1.5 m

D
3 m

Solution

Here, V = 15 × 10⁶ V, dielectric strength
= 5 x 10⁷ V m-¹
Maximum electric field, E = 10% of dielectric strength

As E = V/r

= 3 m