Please solve the 28 number.
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Q.28. The circuit diagram in Fig. 8.53 shows three resistors 2 Ω , 4 Ω , and R Ω connected to a battery of e.m.f. 2 V and internal resistance 3 Ω . If main current of 0.25 A flows through the circuit, find :
(a) the p.d. across the 4 Ω resistor,
(b) the p.d. across the internal resistance of the cell,
(c) the p.d. across the R Ω or 2 Ω resistor, and
(d) the value of R.


Ans. (a) 1 V (b) 0.75 V (c) 0.25 V (d) 2 Ω

Dear student,Net resistance of the circuit,1R'=12+1RR'=2R2+RRNET=2R2+R+4+3=9R+142+Rsince V=IR2=0.25×9R+142+R8=9R+142+RR=2ohma)pd across 4ohm =4×0.25=1Vb) pd across internal resistance=3×0.25=0.75VC)pd across Rohm or 2ohm =2×0.125=0.25VD)R=2ohmRegards

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