Test: Basic Concepts - 1 - Electrical Engineering (EE) MCQ

Let's calculate the charge on the sphere

Understanding the problem:

• A copper sphere loses 10^20 electrons.
• We need to find the total charge on the sphere.

Solution:

• Charge of one electron (e) = -1.6 x 10^-19 C
• Number of electrons removed (n) = 10^20

Total charge (Q) = n * e

Q = 1020 * (-1.6 x 10^-19 C) Q = -1.632 x 10^-16 C

Approximately, Q = -16.02 x 10^-17 C

Therefore, the charge on the sphere is -16.02 C.

So, the correct answer is:

4. -16.02 C

Note that the charge is negative because electrons are removed, leaving a net positive charge on the sphere.

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W = Qv = 360J

In order for 600 C charge to be delivered to the 100 V source, the current must be anticlockwise.

Applying KVL we get

Going from 10 V to 0 V

10 + 5 + E + 1 + 0 = 0 or E =-16 V

Voltage is constant because of 15 V source.

Voltage across 60 Ω resistor = 30 V