MCQ practice · SSC Physics Board questions · Chapter 11: Current Electricity
If a charge Q flows through a conductor in time t, the electric current will be-
Think it through first, then pick an option.
- a I = Q/t
- b I = t/Q
- c I = Qt
- d I = Q²t
Answer and explanation
Correct answer: a I = Q/t
Current is the rate of flow of charge with time: I = Q/t.
Why the other options are wrong
- b I = t/Q: t/Q is the ratio turned upside down and does not give amperes. The right form is I = Q/t.
- c I = Qt: With the product Qt, a longer time would give a larger current; it is a division, I = Q/t.
- d I = Q²t: Q²t has no basis; the book's formula is I = Q/t.
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