SATHEE: Electrostatics Question 351

Electrostatics Question 351

Question: The number of electrons to be put on a spherical conductor of radius $0.1 m$ to produce an electric field of $0.036 N / C$ just above its surface is [MNR 1994; KCET (Engg.) 1999; MH CET (Med.) 2001]

Options:

A) $2.7 \times 10^{5}$

B) $2.6 \times 10^{5}$

C) $2.5 \times 10^{5}$

D) $2.4 \times 10^{5}$

Show Answer

Answer:

Correct Answer: C

Solution:

$E = \frac{1}{4 π ε_{0}} . \frac{n e}{r^{2}}$

therefore $n = \frac{E r^{2}}{e} .4 π ε_{0}$

therefore $n = \frac{0.036 \times 0.1 \times 0.1}{9 \times 10^{9} \times 1.6 \times 10^{- 19}} = \frac{360}{144} \times 10^{5}$ = 2.5x 105 N/C.

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Electrostatics Question 351

Question: The number of electrons to be put on a spherical conductor of radius0.1m to produce an electric field of 0.036N/C just above its surface is [MNR 1994; KCET (Engg.) 1999; MH CET (Med.) 2001]

Options:

Answer:

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Question: The number of electrons to be put on a spherical conductor of radius $0.1 m$ to produce an electric field of $0.036 N / C$ just above its surface is [MNR 1994; KCET (Engg.) 1999; MH CET (Med.) 2001]