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WorksheetsExploring Magnetism and Matter
Total questions: 40
Worksheet time: 21mins
What is the unit of magnetic field strength?
Volt (V)
Tesla (T)
Ampere (A)
Ohm (Ω)
How do magnetic fields affect charged particles?
Magnetic fields cause charged particles to move in circular or helical paths.
Magnetic fields have no effect on the motion of charged particles.
Magnetic fields cause charged particles to move in straight lines.
Magnetic fields attract charged particles to a single point.
What is the difference between ferromagnetic and paramagnetic materials?
Ferromagnetic materials can only be found in metals; paramagnetic materials can be found in all materials.
Ferromagnetic materials lose magnetization at high temperatures; paramagnetic materials retain magnetization at all temperatures.
Ferromagnetic materials are always non-magnetic; paramagnetic materials are always magnetic.
Ferromagnetic materials retain magnetization; paramagnetic materials do not.
What is the principle behind magnetic levitation?
Magnetic levitation works by creating a vacuum around the object.
Magnetic levitation is based on the principle of magnetic forces counteracting gravity.
Magnetic levitation relies on thermal expansion to lift objects.
Magnetic levitation is achieved through the use of electric currents only.
How does the Earth's magnetic field protect us from solar winds?
The Earth's magnetic field deflects solar winds, protecting the atmosphere and surface from harmful charged particles.
The magnetic field generates solar winds, which protect the Earth from cosmic rays.
Solar winds are absorbed by the Earth's atmosphere, preventing any harm.
The Earth's magnetic field attracts solar winds, increasing their intensity.
What is the role of magnetic domains in ferromagnetic materials?
Magnetic domains are regions in ferromagnetic materials where atomic magnetic moments are aligned, influencing the material's overall magnetization.
Magnetic domains are regions that prevent magnetization in ferromagnetic materials.
Magnetic domains are areas where thermal energy is stored in ferromagnetic materials.
Magnetic domains are responsible for electrical conductivity in materials.
How can you visualize a magnetic field?
Use iron filings or a magnetic field sensor to visualize a magnetic field.
Observe the color of the sky during a storm.
Use a compass to measure temperature changes.
Look for changes in the wind direction.
What is the formula for the magnetic force on a moving charge?
F = qE
F = q(v × B)
F = mv^2
F = Bqv
What are the characteristics of diamagnetic materials?
Diamagnetic materials exhibit positive magnetic susceptibility.
Diamagnetic materials have no unpaired electrons, are weakly repelled by magnetic fields, and exhibit a negative magnetic susceptibility.
Diamagnetic materials are strongly attracted to magnetic fields.
Diamagnetic materials have unpaired electrons.
How does temperature affect the magnetism of materials?
Temperature has no effect on magnetism.
Temperature affects magnetism by decreasing it in ferromagnetic materials as it increases, and enhancing it in some materials at low temperatures.
Magnetism is only affected by pressure, not temperature.
Higher temperatures always increase magnetism in all materials.
What is the significance of the Curie temperature?
The Curie temperature is the point where a material becomes superconductive.
The Curie temperature signifies the transition point where a ferromagnetic material becomes paramagnetic.
The Curie temperature is the temperature at which all materials become ferromagnetic.
The Curie temperature indicates the maximum temperature for magnetic storage devices.
How do electromagnets differ from permanent magnets?
Permanent magnets can be turned on and off like electromagnets.
Electromagnets can be turned on and off, while permanent magnets have a constant magnetic field.
Electromagnets are made of permanent materials, while permanent magnets are not.
Electromagnets are always stronger than permanent magnets.
What is the right-hand rule in relation to magnetic fields?
The right-hand rule determines the speed of electric currents.
The right-hand rule is used to calculate resistance in circuits.
The right-hand rule indicates the polarity of batteries.
The right-hand rule helps visualize the direction of magnetic fields around conductors.
What is the effect of a magnetic field on a current-carrying conductor?
A current-carrying conductor generates a magnetic field that cancels the external field.
A magnetic field has no effect on a current-carrying conductor.
A current-carrying conductor experiences a force when placed in a magnetic field.
A current-carrying conductor will always move in the direction of the magnetic field.
What are some common applications of magnetic materials?
Solar panels
Wind turbines
Common applications of magnetic materials include electric motors, transformers, magnetic storage devices, MRI machines, and magnetic sensors.
Batteries
How do magnetic fields influence the behavior of electrons in atoms?
Magnetic fields only influence protons, not electrons.
Magnetic fields have no effect on electron behavior.
Magnetic fields influence electrons by altering their trajectories and energy levels, affecting their spins and leading to phenomena like Zeeman splitting.
Electrons are repelled by magnetic fields, causing them to scatter.
What is the difference between a solenoid and a toroid?
A solenoid is used for AC current, while a toroid is used for DC current.
A solenoid is a straight coil, while a toroid is a circular coil.
A solenoid has a uniform magnetic field, while a toroid has a variable magnetic field.
A solenoid is a circular coil, while a toroid is a straight coil.
How can magnetic fields be used in medical imaging?
Magnetic fields are utilized to heat tissues for faster recovery.
Magnetic fields are used in MRI to create detailed images of the body's internal structures.
Magnetic fields can replace X-rays in all medical procedures.
Magnetic fields are used to generate sound waves for imaging.
What is the relationship between electricity and magnetism?
Electricity can exist without magnetism.
Electric currents do not affect magnetic fields.
Electricity and magnetism are interconnected; electric currents produce magnetic fields, and changing magnetic fields can generate electric currents.
Magnetism is a type of electricity.
What are the applications of superconductors in magnetism?
Electric generators
Solar panels
Wind turbines
Applications of superconductors in magnetism include MRI machines, particle accelerators, and maglev trains.
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°
The angle of dip at a certain place where the horizontal and vertical components of the earth’s magnetic field are equal is
(a) 30°
(b) 75°
(c) 60°
(d) 45°
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
The net magnetic flux through any closed surface, kept in a magnetic field is
(a)
(b)
(c)
(d)
Point out the correct direction of magnetic field in the given figures.
(a)
(b)
(c)
(d)
A magnetic needle is kept in a non-uniform magnetic field. It experiences
(a) a torque but not a force.
(b) neither a force nor a torque.
(c) a force and a torque.
(d) a force but not a torque
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) .
S.I. unit of magnetic dipole moment is (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
