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Worksheetsmagnetism and matter
Total questions: 18
Worksheet time: 14mins
The earth behaves as a magnet with magnetic field pointing approximately from the geographic
(a) North to South
(b) South to North
(c) East to West
(d) West to East
The strength of the earth’s magnetic field is
(a) constant everywhere.
(b) zero everywhere.
(c) having very high value.
(d) vary from place to place on the earths surface.
3. Which of the following is responsible for the earth’s magnetic field?
(а) Convective currents in earth’s core
(b) Diversive current in earth’s core.
(c) Rotational motion of earth.
(d) Translational motion of earth.
Which of the following independent quantities is not used to specify the earth’s magnetic field?
(a) Magnetic declination (θ).
(b) Magnetic dip (δ).
(c) Horizontal component of earth’s field (BH).
(d) Vertical component of earth’s field (BV).
The vertical component of earth’s magnetic field . at a place is √3 times the horizontal component the value of angle of dip at this place is
(a) 30°
(b) 45°
(c) 60°
(d) 90°
3. Which of the following is responsible for the earth’s magnetic field?
(а) Convective currents in earth’s core
(b) Diversive current in earth’s core.
(c) Rotational motion of earth.
(d) Translational motion of earth.
Magnetic moment for solenoid and corresponding bar magnet is
(a) equal for both
(b) more for solenoid
(c) more for bar magnet
(d) none of these
A current carrying loop is placed in a uniform magnetic field in four different orientations as shown in figure. Arrange them in the decreasing order of potential energy.
(a) 4, 2, 3,1
(b) 1, 4, 2, 3
(c) 4, 3, 2,1
(d) 1, 2, 3, 4
Point out the correct direction of magnetic field in the given figures.
(a)
(b)
(c)
(d)
If Mis magnetic moment and B is magnetic field intensity, then the torque is given by
(a)
(b)
(c)
(d)
Angle of dip is 90° at
(a) poles.
(b) equator.
(c) both at equator and poles.
(d) tropic of cancer.
Lines of force, due to earth’s horizontal magnetic field, are
(a) elliptical
(b) curved lines
(c) concentric circles
(d) parallel and straight
Angle between the geographical meridian and magnetic meridian at the given place is known as (a) .
Magnetic moment per unit volume of a material is known as (a) .
The unit of pole strength is (a)
A long magnetic needle of length 2L, magnetic moment M and pole strength m units is broken into two pieces at the middle. The magnetic moment and pole strength of each piece will be
(1)
(2)
(3)
(4)
When a magnetic material is subjected to a very small magnetising force H. The intensity of magnetisation is proportional to :
(a) 1 / H
(b) H
(c) H 2
(d) None of these
Distinguish between dia, para and ferro magneticmaterials. (3M)(
