1
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
A potentiometer circuit is set up as shown. The potential gradient, across the potentiometer wire, is k volt/cm and the ammeter, present in the circuit, reads 1.0 A when two way key is switched off. The balance points, when the key between the terminals (i) 1 and 2 (ii) 1 and 3, is plugged in, are found to be at length $$l$$1 cm and $$l$$2 cm respectively. The magnitudes, of the resistors R and X, in ohms, are then, equal, respectively, to

AIPMT 2010 Prelims Physics - Current Electricity Question 77 English
A
$$k({l_2} - {l_1})$$ and $$k{l_2}$$
B
$$k{l_1}$$ and $$k({l_2} - {l_1})$$
C
$$k\left( {{l_2} - {l_1}} \right)$$ and $$k{l_1}$$
D
$$k{l_1}$$ and $$k{l_2}$$
2
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
Charge q is uniformly spread on a thin ring of radius R. The ring rotates about its axis with a uniform frequency $$f$$ Hz. The magnitude of magnetic induction at the center of the ring is
A
$${{{\mu _0}qf} \over {2\pi R}}$$
B
$${{{\mu _0}qf} \over {2R}}$$
C
$${{{\mu _0}q} \over {2fR}}$$
D
$${{{\mu _0}q} \over {2\pi fR}}$$
3
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
A galvanometer has a coil of resistance 100 ohm and gives a full scale deflection for 30 mA current. If it is to work as a voltmeter of 30 volt range, the resistance required to be added will be
A
900 $$\Omega $$
B
1800 $$\Omega $$
C
500 $$\Omega $$
D
1000 $$\Omega $$
4
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
A square current carrying loop is suspended in a uniform magnetic field acting in the plane of the loop. If the force on one arm of the loop is the net force on the remaining three arms of the loop is
A
$$3\overrightarrow F $$
B
$$-$$ $$\overrightarrow F $$
C
$$-$$ $$3\overrightarrow F $$
D
$$\overrightarrow F $$
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