1
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
Two circular coils 1 and 2 are made from the same wire but the radius of the 1st coil is twice that of the 2nd coil. What is the ratio of potential difference in volts should be applied across them so that the magnetic field at their centres is the same?
A
2
B
3
C
4
D
6
2
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
Curie temperature above which
A
paramagnetic material becomes ferromagnetic material
B
ferromagnetic material becomes diamagnetic material
C
ferromagnetic material becomes paramagnetic material
D
paramagnetic material becomes diamagnetic material
3
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
Two coils of self inductance 2 mH and 8 mH are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is
A
16 mH
B
10 mH
C
6 mH
D
4 mH
4
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
A coil of inductive reactance 31 $$\Omega $$ has a resistance of 8 $$\Omega $$. It is placed in series with a condenser of capacitative reactance 25 $$\Omega $$. The combination is connected to an a.c. source of 110 V. The power factor of the circuit is
A
0.33
B
0.56
C
0.64
D
0.80
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