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In the figure $R_1=4\mathrm{.}42,R_2=13\mathrm{.}3,$ and the ideal battery has emf $E=10\mathrm{.}8V.($a$)$ What is the magnitude of current $i_1?($b$)$ How much energy is dissipated by all four resistors in $2\mathrm{.}35$ min $?$