Physics Current Electricity MDCAT 2012
PMDC Verified Question 104 of 112
Electric charge on an object is measured as 5 micro coulombs. How the value of this charge can be expressed in terms of base unit:
A
\( 5 \times 10^{-3} \text{ ampere second} \)
B
\( 5 \times 10^{-6} \text{ ampere second} \)
C
\( 5 \times 10 \text{ ampere second} \)
D
\( 5 \times 10^{-2} \text{ ampere second} \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: \( 5 \times 10^{-6} \text{ ampere second} \)
Concept:

The SI base units for charge are derived from current and time.

Formula:

$$ Q = I \times t $$

Solution:

  • Given charge \( Q = 5 \, \mu\text{C} \).


  • The prefix "micro" (\(\mu\)) means \( 10^{-6} \). So, \( Q = 5 \times 10^{-6} \text{ Coulombs} \).


  • Since \( 1 \text{ Coulomb} = 1 \text{ Ampere} \times 1 \text{ Second} \).


  • Therefore, \( Q = 5 \times 10^{-6} \text{ ampere second} \).


Why other options are incorrect:

  • Opt A: \( 10^{-3} \) corresponds to milli (m), not micro.


  • Opt C & D: Completely incorrect scale magnitudes for the prefix micro.

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