93. (First problem of Cluster ) (a) R 2 and R 3 are in parallel; their equivalence is in series with R 1 . Therefore, R eq = R 1 + R 2 R 3 R 2 + R 3 =300Ω . (b) The current through the battery is E /R eq =0 . 0200 A, which is also the current through
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