Two identical bar magnets are fixed with their centers at a distance d apart. A stationary charge Q is placed at P in between the gap of the two magnets at a distance D from the centre O as shown in the figure
The force on the charge Q is
A
zero
B
directed along OP
C
directed along PO
D
directed perpendicular to the plane of paper
2
AIPMT 2010 Mains
MCQ (Single Correct Answer)
+4
-1
The magnetic moment of a diamagnetic action is
A
much greater than one
B
1
C
between zero and one
D
equal to zero
3
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
4
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
