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# MCQ in Electricity and Magnetism Fundamentals Part 6 | ECE Board Exam

This is the Multiple Choice Questions Part 6 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.

#### Multiple Choice Questions Topic Outline

• 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 Practice Exam Test Questions Part 6 of the Series

Choose the letter of the best answer in each questions.

251. The relation between absolute permittivity of air (ฮต0), absolute permeability of air (ฮผ0) and velocity of light (c) is given by

A. ฮผ0ฮต0 = c^2

B. ฮผ0ฮต0 = c

C. 1/ฮผ0ฮต0 = c

D. 1/ฮผ0ฮต0 = c^2

Solution:

252. The dielectric constant of most materials lies between

A. 1 and 10

B. 10 and 20

C. 20 and 50

D. 50 and 100

Solution:

253. A test charge means a charge of

A. -1 C

B. 1 electron

C. +1 C

D. -20 C

Solution:

254. Electric lines of force leave or enter the charge surface at an angle of

A. 30

B. 45

C. 90

D. depending upon the angle of launch and entry

Solution:

255. Electric field intensity is measured in

A. volts/meter

B. Newton/meter

C. Newton-meter

D. Amperes/meter

Solution:

256. Electric field intensity is a ____________.

A. scalar

B. phasor

C. vector

D. variable

Solution:

257. Electric field intensity at a point due to a given charge ___________ if the relative permittivity of the medium decreases.

A. decreases

B. remains unchanged

C. increases

D. becomes zero

Solution:

258. The electric field intensity between the parallel plate air capacitor is 20 N/C. If an insulating slab of relative permittivity 5 is placed between the plates, then electric field intensity will be

A. 20 N/C

B. 100 N/C

C. 4 N/C

D. 40 N/C

Solution:

259. The electric flux density is a ___________ quantity.

A. phasor

B. vector

C. scalar

D. variable

Solution:

260. The permittivity of a material is given by one of the following formulas.

A. DE

B. E/D

C. D^2/E

D. D/E

Solution:

261. Electric field intensity at a point is numerically equal to ____________ at that point.

B. potential difference

C. dielectric constant

D. the force

Solution:

262. Three charges of +5 C, -6 C and +9 C are placed inside a sphere. What is the total flux passing through the surface of sphere?

A. 8 C

B. 14 C

C. 20 C

D. -6 C

Solution:

263. The potential at a point due to a charge is 15 V. If the distance is increased three times, the potential at the point will be

A. 5 V

B. 18 V

C. 45 V

D. 15 V

Solution:

264. Electric potential is a __________ quantity.

A. scalar

B. phasor

C. vector

D. variable

Solution:

265. The electric potential at a point in air due to a charge is 21 V. If the air is replaced by a medium of relative permittivity of 3, then electric potential at that point will be

A. 63 V

B. 21 V

C. 7 V

D. 42 V

Solution:

266. The electric potential across part AB of a circuit is 5 V; point A being at higher potential. If a charge of 5 C moves from A to B, then energy released as

A. 5 joules

B. 25 joules

C. 10 joules

D. 100 joules

Solution:

267. What is the other name for dielectric strength?

A. Breakdown voltage

B. Electric intensity

D. Dielectric constant

Solution:

268. Which of the following materials has the highest dielectric strength?

A. Glass

B. Oiled paper

C. Mica

D. Air

Solution:

269. What is used as the insulating material or dielectric in an electric ion?

A. Oiled paper

B. Mica

C. Paraffin

D. Titanate compound

Solution:

270. What is used as the dielectric material in high voltage transformers?

A. Mica

B. Paraffin

C. Porcelain

D. Oiled paper

Solution:

A. 1 coulomb/volt

B. 1 newton/coulomb

C. 1 newton-meter

D. 1 volt/second/ampere

Solution:

272. Which of the following is used by permanent magnets as the magnetic material?

A. iron

B. nickel

C. soft steel

D. hardened steel

Solution:

273. Which of the following is used by temporary magnets as the magnetic material?

A. Hardened steel

B. Cobalt steel

C. Soft iron

D. Tungsten steel

Solution:

274. What is the main advantage of temporary magnets?

A. The magnetic flux can be changed.

B. Hysteresis can be decreased.

C. Magnetic materials can be used.

D. Abundance of ferromagnetic material that can be temporarily magnetized.

Solution:

275. Permanent magnets can be found in

A. electric bells

B. earphones

C. relays

D. dynamic loudspeakers

Solution:

276. Temporary magnets are commonly employed in

A. electric instruments

B. motors

C. moving coils loudspeakers

D. magnetos

Solution:

277. The force between two magnetic poles is ___________ their pole strengths.

A. directly proportional to

B. the sum of

C. inversely proportional to

D. the product of

Solution:

278. If the distance between two magnetic poles decreases by 2 times, the force between them

A. decreases two times

B. increases four times

C. increases two times

D. decreases four times

Solution:

279. The force between two magnetic poles is ____________ the relative permeability of the medium.

A. directly proportional to

B. independent of

C. inversely proportional to

D. equal to

Solution:

280. Two similar poles, each 1Wb, placed 1 m apart in air will experience a repulsive force of

A. 63000 N

B. 63 ร 10^-3 N

C. 8 ร 10^12 N

D. 796 kN

Solution:

281. One weber of flux is equal to ___________ magnetic lines of force.

A. 10^6

B. 10^10

C. 4ฯ ร 10^7

D. 10^8

Solution:

282. The unit of flux density is

A. Wb/m

B. Tesla

C. At/m

D. N/Wb

Solution:

283. What is the typical saturation flux density for most magnetic materials?

A. 4 Wb/m^2

B. 5 Wb/m^2

C. 1 Wb/m^2

D. 2 Wb/m^2

Solution:

284. Magnetic field intensity is a ___________ quantity.

A. scalar

B. phasor

C. vector

D. variable

Solution:

285. The force acting on a pole of 5 Wb is 25 N. What is the intensity of the magnetic field?

A. 5 N/Wb

B. 25 N/Wb

C. 125 N/Wb

D. 0.2 N/Wb

Solution:

286. The relative permeability of a magnetic material is 10^5. What is its permeability?

A. 4ฯ ร 10^5 H/m

B. 4ฯ ร 10^-12 H/m

C. 4ฯ ร 10^-2 H/m

D. 4ฯ ร 10^-7 H/m

Solution:

287. Which of the following has the highest permeability?

A. Soft iron

B. Steel

C. Air

D. Permalloy

Solution:

288. A magnetic pole produces 5000 field lines. How much is the flux in webers?

A. 50 ร 10^-6

B. 5 ร 10^-6

C. 500 ร 10^-6

D. 500 ร 10^-5

Solution:

289. As the magnetic intensity decreases, the relative permeability of a magnetic material

A. decreases

B. remains the same

C. increases

D. becomes zero

Solution:

290. The permeability of a material having a flux density of 5 Wb/m^2 is 10^-5 H/m. What is the value of magnetizing force?

A. 5 ร 10^-5 N/Wb

B. 500 ร 10^3 N/Wb

C. 4ฯ ร 10^-7 N/Wb

D. 4ฯ ร 10^7 N/Wb

Solution:

291. When the relative permeability of a material is slightly less than 1, it is called _________ material.

A. diamagnetic

B. ferromagnetic

C. paramagnetic

D. non-magnetic

Solution:

292. When the relative permeability of a material is slightly more than 1, it is called _________ material.

A. diamagnetic

B. ferromagnetic

C. paramagnetic

D. non-magnetic

Solution:

293. Which of the following is a diamagnetic material?

A. Aluminum

B. Silver

C. Air

D. Cobalt

Solution:

294. Which of the following is a paramagnetic material?

A. Carbon

B. Bismuth

C. Copper

D. Oxygen

Solution:

295. The greater percentage of materials is ____________.

A. diamagnetic

B. paramagnetic

C. ferromagnetic

D. non-magnetic

Solution:

296. When the relative permeability of a material is much greater than 1, it is called __________ material.

A. diamagnetic

B. ferromagnetic

C. paramagnetic

D. non-magnetic

Solution:

297. The flux density in an air-cored coil is 10^-3 Wb/m^2. With a cast iron core of relative permeability 100 inserted, the flux density will become

A. 10^-3 Wb/m^2

B. 10^-2 Wb/m^2

C. 10^3 Wb/m^2

D. 0.1 Wb/m^2

Solution:

298. At/m is a unit of

A. mmf

B. magnetic force

C. reluctance

D. magnetic flux density

Solution:

299. The direction of force o a current carrying conductor placed in a magnetic field can be found by

A. Cork screw rule

B. Flemingโs left hand rule

C. Flemingโs right hand rule

D. using a compass

Solution:

300. When a current carrying conductor is placed in a magnetic field, the maximum force will act on the conductor when the conductor is at an angle of ___________ to the magnetic field.

A. 45

B. 60

C. 30

D. 90

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: MCQ from Number 1 โ 50                        Answer key: PART 1
PART 2: MCQ from Number 51 โ 100                   Answer key: PART 2
PART 3: MCQ from Number 101 โ 150                 Answer key: PART 3
PART 4: MCQ from Number 151 โ 200                 Answer key: PART 4
PART 5: MCQ from Number 201 โ 250                 Answer key: PART 5
PART 6: MCQ from Number 251 โ 300                  Answer key: PART 6
PART 7: MCQ from Number 301 โ 350                  Answer key: included
PART 8: MCQ from Number 351 โ 400                  Answer key: included
PART 9: MCQ from Number 401 โ 450                  Answer key: included
PART 10: MCQ from Number 451 โ 500                 Answer key: included

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

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