28. The circuit diagram in Fig. 8.53 shows three resistors 2 Ω, 4 Ω, and R 2 connected to a battery

28. The circuit diagram in Fig. 8.53 shows three resistors 2 Ω, 4 Ω, and R 2 connected to a battery of e.m.f. 2 V and internal resistance 3 2. 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 2 or 2 Ω resistor, and

(d) the value of R.