1
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
The resistances in the two arms of the meter bridge are 5 $$\Omega $$ and R$$\Omega $$ respectively. When the resistance R is shunted with an equal resistance, the new balance point is at 1.6$$l$$1. The resistance R is

AIPMT 2014 Physics - Current Electricity Question 95 English
A
10 $$\Omega $$
B
15 $$\Omega $$
C
20 $$\Omega $$
D
25 $$\Omega $$
2
AIPMT 2014
MCQ (Single Correct Answer)
+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 $$\Omega $$
3
AIPMT 2014
MCQ (Single Correct Answer)
+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
4
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
Two identical long conducting wires $$AOB$$ and $$COD$$ are placed at right angle to each other, with one above other such that $$O$$ is their common point for the two. The wires carry $$I$$1 and $$I$$2 currents, respectively. Point $$P$$ is lying at distance f from $$O$$ along a direction perpendicular to the plane containing the wires. The magnetic field at the point $$P$$ will be
A
$${{{\mu _0}} \over {2\pi d}}\left( {{{{I_1}} \over {{I_2}}}} \right)$$
B
$${{{\mu _0}} \over {2\pi d}}\left( {{I_1} + {I_2}} \right)$$
C
$${{{\mu _0}} \over {2\pi d}}\left( {I_1^2 - I_2^2} \right)$$
D
$${{{\mu _0}} \over {2\pi d}}{\left( {I_1^2 + I_2^2} \right)^{1/2}}$$
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