Answer
$$42\times 10^{5}\ \mu A .$$
Work Step by Step
Since $ 1A =10^{6} \ \mu A$, then we have
$$4.2 \ A=4.2 \times 10^{6}\ \mu A =42\times 10^{5}\ \mu A .$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 3 - Review - Page 157: 17
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