Question

Two resistances 10$\Omega$and 15$\Omega$are connected in series. A cell of e.m.f. 1.5V of negligible resistance is connected between their ends. Then
a) current flowing through 15$\Omega$resistance is 60mA
b) P.d across 10$\Omega$resistance 0.9V
c) P.d across 15$\Omega$resistance is 0.9V
d) resultant resistance is 6$\Omega$

• A. a and c are true
• B. b and d are true
• C. a and d are true
• D. b and c are true

Answer 1

Answer: (A)

a and c are true

$R_{eff}=10+15=25$
$\Rightarrow I=\frac{1.5}{25}=\frac{3}{50}=0.06A$
$=60mA$
$P.Dacross10=0.06\times 10$
$=0.6V$
$P.Dacross15=0.06\times 15$
$=0.9V$