The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10 $$\Omega $$ is
A
0.8 $$\Omega $$
B
1.0 $$\Omega $$
C
0.2 $$\Omega $$
D
0.5 $$\Omega $$
2
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
A cell having an emf $$\varepsilon $$ and internal resistance r is connected across a variable external resistance R. As the resistance R is increased, the plot of potential difference V across R is given by
A
B
C
D
3
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
The power dissipated in the circuit shown in the figure is 30 watts. The value of R is
A
20 $$\Omega $$
B
15 $$\Omega $$
C
10 $$\Omega $$
D
30 $$\Omega $$
4
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
In the circuit shown the cells A and B have negligible resistances. For VA = 12 V, R1 = 500 $$\Omega $$ and R = 100 $$\Omega $$ the galvanometer (G) shows no deflection. The value of Vs is
