1
AIPMT 2014
+4
-1
A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used across the potentiometer wire, has an emf of 2.0 V and a negligible internal resistance. The potentiometer wire itself is 4 m long. When the resistance R, connected across the given cell, has values of (i) infinity,    (ii) 9.5 $$\Omega$$
the balancing lengths on the potentiometer wire are found to be 3 m and 2.85 m, respectively. The value of internal resistance of the cell is
A
0.25 $$\Omega$$
B
0.95 $$\Omega$$
C
0.5 $$\Omega$$
D
0.75 $$\Omega$$
2
AIPMT 2014
+4
-1
Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 8 volt and the average resistance per km is 0.5 $$\Omega$$. The power loss in the wire is
A
19.2 W
B
19.2 kW
C
19.2 J
D
12.2 kW
3
NEET 2013 (Karnataka)
+4
-1
Two rods are joined end to end, as shown. Both have a cross-sectional area of 0.01 cm2. Each is 1 meter long. One rod is of copper with a resistivity of 1.7 $$\times$$ 10$$-$$6 ohm-centimeter, the other is of iron with a resistivity of 10$$-$$5 ohm-centimeter. How much voltage is required to produce a current of 1 ampere in the rods?
A
0.00145 V
B
0.0145 V
C
1.7 $$\times$$ 10$$-$$6 V
D
0.117 V
4
NEET 2013 (Karnataka)
+4
-1
A 12 cm wire is given a shape of a right angled triangle ABC having sides 3 cm, 4 cm and 5 cm as shown in the figure. The resistance between two ends (AB, BC, CA) of the respective sides are measuread one by one ratio A
9 : 16 : 25
B
27 : 32 : 35
C
21 : 24 : 25
D
3 : 4 : 5
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