# MCQ in Electricity and Magnetism Fundamentals Part 11 | ECE Board Exam

(Last Updated On: August 3, 2018)

This is the Multiple Choice Questions Part 11 of the Series in Electricity and Magnetism Fundamentals as one of the Electronics Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in Electronics Engineering field, Electronics Books, Journals and other Electronics References.

### MCQ Topic Outline included in ECE Board Exam Syllabi

• MCQ in Atomic Structure
• MCQ in Electric Charge
• MCQ in Ohm’s Law, Kirchoff Law, Coulomb’s Law, etc
• MCQ in Magnetic Power
• MCQ in Magnetic Field and Magnetic Flux
• MCQ in Magnetic and Electric Quantities / Units
• MCQ in Magnetic/Electromagnet Principles

### Continue Pratice Exam Test Questions Part 11 of the Series

Choose the letter of the best answer in each questions.

501. Magnetic intensity is

A. a vector quantity

B. a scalar quantity

C. an imaginary quantity

D. either a vector or scalar

Solution:

502. The Gauss is a unit of

A. permeability

B. electromagnetic force

C. magnetic force

D. magnetic flux density

Solution:

503. What is the unit of flux in cgs?

A. Ampere-turn (At)

B. Coulomb/sec. (C/s)

C. Maxwell (Mx)

D. Gauss

Solution:

504. One Weber is equivalent to

A. 10^8 Maxwells

B. 10^6 Maxwells

C. 10^4 Maxwells

D. 10^2 Maxwells

Solution:

505. The equivalent of 1 x 10^9 Maxwells is

A. 1 Weber

B. 10 Weber

C. 100 Weber

D. 1,000 Weber

Solution:

506. A magnetic flux of 500,000,000 lines is equivalent to

A. 5 x 10^8 Maxwells

B. 5 Weber

C. 500 x 10^6 MAxwells

D. all of these

Solution:

507. The unit of flux density in mks

A. Gauss

B. Weber/m^2

C. Maxwell

D. Tesla

Solution:

508. What do you call the force that sets up or tends to set up magnetic flux in a magnetic circuit?

A. electromotive force

B. potential difference

C. magnetomotive force

D. dynamic force

Solution:

509. Voltage in electrical circuits is analogous to _________ in magnetic circuits.

A. Ampere-turn

B. Magnetomotive force

C. Magnetizing force

D. Flux

Solution:

510. Electrical current is analogous to _________ in magnetic circuits.

A. Ampere-turn

B. Magnetomotive force

C. Magnetizing force

D. Flux

Solution:

511. __________ capability is analogous to permeance.

B. Conductance

C. Reluctance

D. Resistance

Solution:

512. Resistance in electrical circuits is analogous to _________ in magnetic circuits.

A. Conductance

B. Permeance

C. Elastance

D. reluctance

Solution:

513. The property of a material which opposes the creation of magnetic flux.

A. elastance

B. permeance

C. susceptance

D. reluctance

Solution:

214. The reciprocal of reluctance

A. conductance

B. permeance

C. elastance

D. capacitance

Solution:

515. Permeance is analogous to

A. conductance

B. resistance

C. impedance

D. elastance

Solution:

516. Is the reciprocal of reluctance and implies the readiness of a material to develop magnetic flux.

A. elastance

B. permeance

C. susceptance

D. conductance

Solution:

517. Magnetic circuit property that permits flux.

A. elastance

B. permeance

C. susceptance

D. conductance

Solution:

518. It is easier to establish flux line in soft iron than it is to establish them in air, this is because iron has a lower

A. Permeance

B. Inductance

C. elastance

D. reluctance

Solution:

519. The Oersted (Oe) is the same as

A. 1 Gb/cm

B. 1 Gb/m

C. 10 Gb/cm

D. 10 Gb/cm

Solution:

520. The unit of reluctance

A. Gilbert

B. Tesla

C. At/Wb

D. Gauss

Solution:

521. It is the specific reluctance of a material.

A. resistivity

B. retentivity

C. reluctivity

D. permeability

Solution:

522. At/m is a unit of

A. magnetic field

B. reluctance

C. magnetizing force

D. magnetic power

Solution:

523. Magnetomotive force has a unit of

A. Volt (V)

B. Watt (W)

C. Joule (J)

D. Ampere-turn (At)

Solution:

524. The cgs unit of magnetomotive force

A. Volt

B. Weber

C. Gilbert

D. Ampere-turn

Solution:

525. One Gilbert is equal to

A. 0.0796 At

B. 0.796 At

C. 7.96 At

D. 79.6 At

Solution:

526. One Ampere-turn (At) is equivalent to

A. 0.126 Gilbert

B. 1.260 Gilberts

C. 12.60 Gilberts

D. 126 Gilberts

Solution:

527. The current needed for a coil of 200 turns to provide a 400 ampere turn magnetizing force is

A. 2 A

B. 4 A

C. 6 A

D. 8 A

Solution:

528. Determine the ampere-turns when a 10 V battery is connected across a solenoid having 100 turns and a resistance of 5 Ω.

A. 50 At

B. 200 At

C. 100 At

D. 1,000 At

Solution:

529. What is residual magnetism?

A. The external magnetic field when the current is flowing through the exciting coil.

B. The flux density, which exist in the iron core when the magnetic field intensity is reduced to zero.

C. The flux density, which exist in the iron core when the magnetic field intensity is at its maximum value.

D. The flux density when the magnetic core is saturated.

Solution:

530. When you demagnetize property by applying an AC field and then gradually reduced it to zero, it is called

A. damping

B. decaying

C. degaussing

D. gaussing

Solution:

531. In a magnetic circuit, a flux that drifts away from its intended path is called

A. lost flux

C. drift flux

D. leakage flux

Solution:

532. Is the quantity of magnetizing force needed to counter balance the residual magnetism of a magnetic material.

A. hysteresis

B. degaussing

C. retentivity

D. coercivity

Solution:

533. What do you call the loss of electrical energy in counter balancing the residual magnetism in each cycle?

A. hysteresis

B. magnetomotive

C. leakage

D. coercivity

Solution:

534. The amount of magnetic field needed to remove residual magnetism from a transformer core during each half cycle is called the

A. coercive force

B. residual field

C. hysteresis field

D. demagnetizing force

Solution:

535. If a wire coil has 100 turns and carries 1.3 A of current, calculate the magnetomotive force in Gilbert.

A. 163.3

B. 16.33

C. 1.633

D. 0.1633

Solution:

536. An advantage of an electromagnet over a permanent magnet

A. An electromagnet can be demagnetized

B. An electromagnet is simpler

C. An electromagnet is cheaper

D. An electromagnet can be switched ON and OFF

Solution:

537. Electromagnet whose core is in the form of a close magnetic ring

A. solenoid

B. relay

C. toroid

D. circular

Solution:

538. Magnetic flux can always be attributed to

A. static charged particles

B. motion of charge particles

C. static electric field

D. every applied potential

Solution:

539. What is a magnetic field?

A. A force set up when current flows through a conductor.

B. A force set up when a charged body is at static.

C. The space between two electrically charged particles.

D. The space around a conductor.

Solution:

540. Which of the following determines the strength of a magnetic field around a conductor?

A. amount of current

B. diameter of the conductor

C. length of the conductor

D. amount of voltage

Solution:

541. The magnetic flux around a straight, current carrying wire, is stronger

A. near the edge

B. near the wire

C. at the center

D. at both edge

Solution:

542. In what direction is the magnetic field about a conductor when current is flowing?

A. In a direction determined by the left-hand rule.

B. Always in a clock wise direction.

C. Always in a counter clockwise direction.

D. In a direction determined by the right-hand screw rule.

Solution:

543. If the electrical current carried by each of the two long parallel wire is doubled, and their separation is also doubled, the force between them

A. also doubles

B. increases by a factor of four

C. decreases by a factor of four

D. decreases by a factor of two

Solution:

544. Reversing the flow of current in a circuit

A. reverses the magnetic polarity

B. increase the magnetic field intensity

C. decreases the magnetic intensity

D. enhances hysteresis

Solution:

545. Is used to maintain strength of magnetic field.

A. storer

B. energizer

C. gausser

D. keeper

Solution:

546. What law that describes the force of attraction or repulsion between two magnetic poles is directly proportional to their strengths?

A. Coulomb’s first law

B. Coulomb’s second law

C. Ampere’s law

D. Gauss’ law

Solution:

547. What is the law whereby the force of attraction or repulsion between poles is inversely proportional to the square of the distance between them?

A. Coulomb’s first law

B. Coulomb’s second law

C. Coulomb’s third law

D. Coulomb’s law

Solution:

548. The physical motion resulting from the forces of magnetic fields.

A. motor action

B. linear motion

C. rectilinear motion

D. generator action

Solution:

549. What law in electronics where an induced current will be in such a direction that its own magnetic field will oppose the magnetic field that produces the same?

A. Electromagnetic law

B. Norton’s law

C. Lenz law

D. Maxwell law

Solution:

550. A changing magnetic field

A. produces an electric field

B. induces potential

C. produces a fluctuating electric field

D. produces a steady electric field

Solution:

### Questions and Answers in Electricity and Magnetism Fundamentals

Following is the list of multiple choice questions in this brand new series:
MCQ in Electricity and Magnetism Fundamentals
PART 1: MCQs from Number 1 – 50                        Answer key: PART I
PART 2: MCQs from Number 51 – 100                   Answer key: PART II
PART 3: MCQs from Number 101 – 150                 Answer key: PART III
PART 4: MCQs from Number 151 – 200                 Answer key: PART IV
PART 5: MCQs from Number 201 – 250                 Answer key: PART V
PART 6: MCQs from Number 251 – 300                 Answer key: PART VI
PART 7: MCQs from Number 301 – 350                 Answer key: included
PART 8: MCQs from Number 351 – 400                Answer key: included
PART 9: MCQs from Number 401 – 450                 Answer key: included
PART 11: MCQs from Number 501 – 550                 Answer key: included

### Complete List of MCQ in Electronics Engineering per topic

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