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
2
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
A
4 V
B
2 V
C
12 V
D
6 V
3
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
A ring is made of a wire having a resistance R0 = 12 $$\Omega $$. Find the points A and B, as shown in the figure, at which a current carrying conductor should be connected so that the resistance R of the sub circuit between these point is equal to $${8 \over 3}\Omega $$.
A
$${{{l_1}} \over {{l_2}}} = {5 \over 8}$$
B
$${{{l_1}} \over {{l_2}}} = {1 \over 3}$$
C
$${{{l_1}} \over {{l_2}}} = {3 \over 8}$$
D
$${{{l_1}} \over {{l_2}}} = {1 \over 2}$$
4
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
If voltage across a bulb rated 220 volt-100 watt drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is
