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
In the circuit shown, if a conducting wire is connected between points A and B, the current in this wire will

AIPMT 2006 Physics - Current Electricity Question 73 English
A
flow from B to A
B
flow from A to B
C
flow in the direction which will be decided by the value of V be zero.
D
be zero
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
The core of a transformer is laminated because
A
ratio of voltage in primary and secondary may be increased
B
energy losses due to eddy currents may be minimised
C
the weight of the transformer may be reduced
D
rusting of the core may be prevented.