1
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 $$\Omega $$
2
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
Electromagnets are made of soft iron because soft iron has
A
low retentivity and high coercive force
B
high retentivity and high coercive force
C
low retentivity and low coercive force
D
high retentivity and low coercive force
3
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
A vibration magnetometer placed in magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2 sec in earth's horizontal magnetic field of 24 microtesla. When a horizontal field of 18 microtesla is produced opposite to the earth's field by placing a current carrying wire, the new time period of magnet will be
A
1 s
B
2 s
C
3 s
D
4 s
4
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
A conducting circular loop is placed in a uniform magnetic field, B = 0.025 T with its plane perpendicular to the loop. The radius of the loop is made to shrink at a constant rate of 1 mm s$$-$$1. The induced emf when the radius is 2 cm, is
A
$$2\pi \mu V$$
B
$$\pi \mu V$$
C
$${\pi \over 2}\mu V$$
D
2$$\mu $$$$V$$
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