Q. Following figure shows four situations in which positive and negative charges move horizontally through a region and gives the rate at which each charge moves. Rank the situations according to the effective current through the region greatest first
A) $i = ii = iii = iv$
B) $i > ii > iii > iv$
C) $i = ii = iii > iv$
D) $i = ii = iii < iv$
Explanation
(c) For figure (i) $i_{1} = 7A$
For figure (ii) $i_{2} = 4 + 3 = 7A$
For figure (iii) $i_{3} = 5 + 2 = 7A$
For figure (iv) $i_{4} = 6 - 1 = 5A$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.