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The current flowing through a wire depends on time as I = 3t2 + 2t +5. The charge flowing through the cross-section of the wire in time from t = 0 to t = 2 sec. is

  • a)
    22C

  • b)
    20C

  • c)
    18C

  • d)
    5C

Correct answer is option 'A'. Can you explain this answer?
Verified Answer
The current flowing through a wire depends on time as I = 3t2 + 2t +5....
Explanation:

Given:
- Current flowing through the wire: I = 3t2 + 2t + 5
- Time interval: t = 0 to t = 2 sec

Charge Flowing Through the Cross-Section of the Wire:
- The charge flowing through the wire is given by the integral of current with respect to time.
- Q = ∫(3t2 + 2t + 5) dt
- Q = [t3 + t2 + 5t] evaluated from t = 0 to t = 2 sec
- Q = [(2)3 + (2)2 + 5(2)] - [(0)3 + (0)2 + 5(0)]
- Q = [8 + 4 + 10] - [0 + 0 + 0]
- Q = 22 C

Therefore, the charge flowing through the cross-section of the wire from t = 0 to t = 2 sec is 22 Coulombs. Hence, the correct answer is A: 22C.
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