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Figure 7 shows resistors R1 and R2 connected in parallel. Their ends are connected to a battery of potential difference V volts.
(i) In terms of V1, R1, and R2, write an expression for (I) Current I1 through R1.
(II) Current I2 through R2. (III) Total current I in the circuit. (ii) Show that the total resistance RT is given by #R_T = (R_1R_2)/(R_1 + R_2#