First slide

electric current

Question

Following figure shows four situations in which positive and negative charges moves 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

Moderate

A

i = ii = iii = iv
B

i > ii > iii > iv
C

iii $>$ i $>$ ii=iv
D

i = ii = iii < iv

Solution

For figure (i) $i_{1} = 7 A$
For figure (ii) $i_{2} = 3 + 2 = 5 A$
For figure (iii) $i_{3} = 5 + 4 = 9 A$
For figure (iv) $i_{4} = 6 - 1 = 5 A$

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