Two conducting rods when connected between two points at constant but different temperatures separately, the rate of heat flow through them is `q_1 and q_2`.A. When they are connected in series, the net rate of heat flow is `q_1 + q_2`B. When they are connected in series, the net rate of heat flow is `((q_1q_2)/(q_1+q_2))`C. When they are connected in parallel, the net rate of heat flow is `q_1 + q_2`D. When they are connected in parallel, the net rate of heat flow is `((q_1q_2)/(q_1+q_2))`

Two conducting rods when connected between two points at constant but

1.	Two conducting rods when connected between two points at constant but different temperatures separately, the rate of heat flow through them is `q_1 and q_2`.A. When they are connected in series, the net rate of heat flow is `q_1 + q_2`B. When they are connected in series, the net rate of heat flow is `((q_1q_2)/(q_1+q_2))`C. When they are connected in parallel, the net rate of heat flow is `q_1 + q_2`D. When they are connected in parallel, the net rate of heat flow is `((q_1q_2)/(q_1+q_2))`
Answer» Correct Answer - B::C<br>`q_1 = (TD)/R_1`<br> `R_1 = (TD)/q_1`<br> Similarly, `R_2 = (TD)/q_2`<br> In series,<br> `q_s = (TD)/(R_1+R_2)= (TD)/(((TD)/q_1) + ((TD)/q_2))`<br> `=(q_1q_2)/(q_1+q_2)`<br> In parallel, `q_p = (TD)/R_(net) = (TD) (1/R_(net))`<br> `=TD (1/R_1 + 1/R_2)`<br> `=TD ( q_1/(TD) + q_2/(TD)) = q_1 + q_2` .

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