Initially, a single resistor, R1 is wired to a battery. Then resistor R2 is added in parallel. Are (a) the potential difference across R1 and (b) the current i1 through R1 now more than, less than, or the same as previously? (c) Is the equivalent resistance R12 of R1 and R2 more than, less than, or equal to R1? (d) Is the total current through R1 and R2 together more than, less than, or equal to the current through R1 previously?
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