A 19.5-cm cm-diameter loop of wire is initially oriented perpendicular to a 1.9-TT magnetic field. The loop is rotated so that its plane is parallel to the field direction in 0.17 ss .what is the average induce emf in the loop?

A., d., and f i think

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Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current