Magnetic Effects of Electric Current Test

Result

Magnetic Effects of Electric Current Test - 32

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Weekly Quiz Competition

Question 1
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Which of the following figures depict non uniform magnetic field?

A

B

C

D

Solution

Uniform magnetic field has a bunch of symmetric lines of forces arranged in a regular fashion. So the correct option is D as lines of forces are not arranged in the regular fashion.
Question 2
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The magnetic lines of force due to a bar magnet are

A
Curved lines

B
Curved closed loops

C
Concentric circles

D
Parallel and straight

Solution

The magnetic lines of force due to a bar magnet are closed loops. The field lines are directed from the north pole to the south pole outside the magnet. The field lines are directed from the south pole to the north pole inside the magnet.
Question 3
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Which converts mechanical energy into electrical energy

A
Motor

B
Battery

C
Generator

D
Switch

Solution

A generator is a device that converts motive power into electrical power for use in an external circuit. Sources of mechanical energy include steam turbines, gas turbines, water turbines, internal combustion engines, wind turbines, and even hand cranks.
Question 4
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Direction of induced EMF can be found from

A
Lenz law

B
Laplace law

C
Fleming law

D
None of the above
Question 5
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Which of the following electrical devices works on the principle of electro-magnetic induction ?

A
Electric fan

B
Electric bulb

C
Electric cooker

D
L.E.D.

Solution

Electric fan works on the principle of electro - magnetic induction. An electric fan works with the help of an electric motor the electric motor consists of a coil of wire wound around a metallic core. As electric current passes through the coil of wires, it produces rotational motion due to electro - magnetic induction.
Question 6
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Electromagnetic induction is not used in :

A
Transformer

B
Room heater

C
AC generator

D
Choke coil

Solution

Room heater works on the principle of Joule's heating effect of current. It states that heat is produced in the conductor (or resistor) by passing an electric current through it for some time. While transformer, AC generator, and choke coil, all work on the principle of Electromagnetic Induction.

Hence, the correct option is B
Question 7
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Which one of the following statements best describes the nature of the field lines due to a bar magnet?

A
Field lines start from the north pole and end on the south pole. Any number of field lines can pass through a point

B
Field lines start from the north pole and end on the south pole. Only one field line passes through a point

C
Field lines are continuous lines passing inside and outside the magnet. Only one field line passes through a point

D
Field lines are continuous lines passing inside and outside the magnet. Any number of field lines can pass through a point

Solution

The properties of magnetic filed lines are that they start from north pole and end at south pole (outside the magnet). But they flow from south to north pole inside the magnet forming a continuous closed loop. They are very near to each other where the magnetic field is strong whereas they are far away from each other where magnetic field is weak. At poles, magnetic field is the strongest. Thus the magnetic lines of forces are the nearest at the poles. No two magnetic line of forces intersect with each other.
Thus correct answer is option C.
Question 8
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Electromagnetic induction is not used in :

A
Transformer

B
Room heater

C
AC generator

D
Choke coil

Solution

Electromagnetic induction is used in transformers, AC generators and choke coils. This phenomenon is responsible for induction of voltage in secondary coils in transformers and for induction of voltage due to change to flux through the coil in AC generators. Choke coils are inductors used to block higher-frequency alternating current (AC) in an electrical circuit, while passing lower-frequency or direct current (DC).
However a room heater works on the principle of power radiated by passing current though a resistor in accordance with the Ohm's Law.
Question 9
1 / -0

Electromagnetic induction is not used in

A
Transformer

B
Room heater

C
AC generator

D
Choke coil

Solution

Room heater works on the principle of Joule's heating effect of current that heat is produced in the conductor (or resistor) on passing an electric current through it for some time.
While transformer, AC generator, and choke coil work on the principle of Electromagnetic induction.
Question 10
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The phenomenon of producing an emf in a circuit whenever the magnetic flux linked with a coil changes is ................................

A
Electro-magnetic induction

B
Inducing current

C
Inducing voltage

D
Change in current

Solution

The phenomenon of producing an emf in a circuit whenever the magnetic flux linked with a coil changes is electromagnetic induction. Electromagnetic induction is the production of an electromotive force (i.e., voltage) across an electrical conductor due to its dynamic interaction with a magnetic field. It has found many applications in technology, including electrical components such as inductors and transformers, and devices such as electric motors and generators.