The work done in moving a unit positive charge from one point to another against an electric field is known as:
A. Potential Difference
B. Electric Flux
C. Capacitance
D. Electric Field Intensity
Answer: Option A
Solution (By JKSSB Mock Tests)
By definition, the electric potential difference between two points in an electric field is the amount of external work required to move a unit positive charge (1 Coulomb) slowly and without acceleration from one point to the other against the electrostatic force. The SI unit of potential difference is the Volt (Joules/Coulomb).
What is the equivalent resistance when n identical resistors, each of resistance R, are connected in series, compared to when they are connected in parallel?
A.Parallel resistance is n² times the series resistance.
B.Series resistance is equal to the parallel resistance.
C.Series resistance is n² times the parallel resistance.
D.Series resistance is n times the parallel resistance.
Explanation:
When n resistors of resistance R are in series, Rs = nR. When connected in parallel, Rp = R/n. To find the ratio, Rs / Rp = (nR) / (R/n) = n². Therefore, the series resistance is n² times the equivalent parallel resistance. This is a highly frequent numerical shortcut for exams.
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