Electrostatics (KVPY Stream-SA (Class 11) Physics): Questions 5 - 8 of 15

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Question number: 5

» Electrostatics » Electric Potential

MCQ▾

Question

An electron with an initial speed of 5.5 × 106 ms-1 is brought to rest by an electric field. The mass and charge of an electron are 9 × 10-31 kg and 1.6 × 10-19 C, respectively. Identify the correct statement

Choices

Choice (4) Response

a.

The electron moves from a region of higher potential to lower potential through a potential difference of 22.4 μV.

b.

The electron moves from a region of lower potential to higher potential through a potential difference of 85.07 V.

c.

The electron moves from a region of higher potential to lower potential through a potential difference of 85.07 V

d.

The electron moves from a region of lower potential to higher potential through a potential difference of 22.4 μV.

Question number: 6

» Electrostatics » Capacitors

MCQ▾

Question

70 sheets of mica, each of thickness 0.25 mm are interspersed with aluminum foils of area 50 cm2. The metal sheets are connected alternately to form a system of capacitors. The capacitance of the capacitor is –

Choices

Choice (4) Response

a.

91.25nF

b.

77.16μF

c.

86.73nF

d.

77.16nF

Question number: 7

» Electrostatics » Coulomb's Law

MCQ▾

Question

The excess (equal in number) of electrons that must be placed on each of two small sphered 3 cm apart with force of repulsion between sphere to be 10-19 N, is

Choices

Choice (4) Response

a.

125

b.

625

c.

25

d.

50

Question number: 8

» Electrostatics » Capacitors

MCQ▾

Question

40 sheets of mica, each of thickness 0.3 mm are interspersed with aluminum foils of area 35 cm2. The metal sheets are connected alternately to form a system of capacitors. The capacitance of the capacitor is –

Choices

Choice (4) Response

a.

28.91nF

b.

53.73nF

c.

32.16nF

d.

17.16μF

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