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Standard X
Physics
Bar Magnet
At the magnet...
Question
At the magnetic poles of earth the compass needle will be 1.vertical 2.bent slightly 3.horizontal 4.inclined at 45 degree to horizontal
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Q.
Assertion :A compass needle when placed on the magnetic north pole of the earth rotates in vertical direction. Reason: The earth has only horizontal component of its magnetic field at the north pole.
Q.
Assertion :A compass needle, when placed on the magnetic north pole of the earth, rotates in the horizontal direction. Reason: The earth has only horizontal component of its mangetic field at the north poles.
Q.
The needle of a magnetic compass becomes horizontal at Earth’s:
Q.
At some location on earth the horizontal component of earth's magnetic field is
18
×
10
−
6
T
. At this location, magnetic needle of length
0.12
m
and pole strength
1.8
Am
is suspended from its mid-point using a thread, it makes
45
∘
angle with horizontal in equilibrium.To keep this needle horizontal,the vertical force that should be applied at one of its ends is
Q.
(a) Small compass needle of magnetic moment 'm' is free to turn about an axis perpendicular to the direction of uniform magnetic field 'B'. The moment of inertia of the needle about the axis is 'I'. The needle is slightly disturbed from its stable position and then released. Prove that it executes simple harmonic motion. Hence deduce the expression for its time period.
(b) A compass needle , free to turn in a vertical plane orients itself with its axis vertical at a certain place on the earth. find out the values of (i) horizontal component of earth's magnetic field and (ii) angle of dip at the place.
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