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Concepts Of Physics MCQ Edition [Volume 2]
Exam
Concepts Of Physics MCQ Edition [Volume 2]
Subject
Physics
Chapter
Electric Current in Conductors

Concepts Of Physics MCQ Edition [Volume 2] · Physics · Electric Current in Conductors

A discharge tube carries an electric current of 2.0 . Determine the...

A discharge tube carries an electric current of 2.0μA2.0 \mu\text{A}. Determine the amount of charge that passes through a cross-section of the tube in 55 minutes.

Options

  1. A1.2×10−4 C1.2 \times 10^{-4} \text{ C}
  2. B1.0×10−5 C1.0 \times 10^{-5} \text{ C}
  3. C3.6×10−2 C3.6 \times 10^{-2} \text{ C}
  4. D6.0×10−4 C6.0 \times 10^{-4} \text{ C}

Correct answer

D. 6.0×10−4 C6.0 \times 10^{-4} \text{ C}

Step-by-step solution

Given current I=2.0μA=2.0×10−6 AI = 2.0 \mu\text{A} = 2.0 \times 10^{-6} \text{ A}

Time t=5 minutes=5×60 s=300 st = 5 \text{ minutes} = 5 \times 60 \text{ s} = 300 \text{ s}

The amount of charge QQ passing through a cross-section is given by the relation Q=I×tQ = I \times t

Substituting the values:

Q=2.0×10−6×300Q = 2.0 \times 10^{-6} \times 300

Q=600×10−6 CQ = 600 \times 10^{-6} \text{ C}

Q=6.0×10−4 CQ = 6.0 \times 10^{-4} \text{ C}
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