Electric Charge Physics Example 1

Follow the full solution, then compare it with the other examples linked below.

Example 1

easy
An object has an excess of 3.0ร—10133.0 \times 10^{13} electrons. What is the total electric charge on the object? Use e=1.6ร—10โˆ’19ย Ce = 1.6 \times 10^{-19} \text{ C}.

Solution

  1. 1
    Each electron carries a charge of โˆ’1.6ร—10โˆ’19ย C-1.6 \times 10^{-19} \text{ C}.
  2. 2
    Total charge: Q=ne=3.0ร—1013ร—(โˆ’1.6ร—10โˆ’19)Q = ne = 3.0 \times 10^{13} \times (-1.6 \times 10^{-19})
  3. 3
    Q=โˆ’4.8ร—10โˆ’6ย C=โˆ’4.8ย ฮผCQ = -4.8 \times 10^{-6} \text{ C} = -4.8 \text{ } \mu\text{C}

Answer

Q=โˆ’4.8ย ฮผCQ = -4.8 \text{ } \mu\text{C}
Electric charge is a fundamental property of matter. It is quantized โ€” it always comes in multiples of the elementary charge e=1.6ร—10โˆ’19ย Ce = 1.6 \times 10^{-19} \text{ C}. Excess electrons give a negative charge.

About Electric Charge

A fundamental property of matter that causes it to experience a force in an electromagnetic field. Measured in coulombs (C).

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Example 4 hard

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