# Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-16

226. The maximum current in the circuit of Q. 225 will be

a) 1 A
b) 100 A
c) 2 A
d) 5 A

Ans: (a)

227.If D is the electric displacement density and E is the electric field strength, then D and E can be related by

a) D = E2
b) D = E/ε
c) D = εE2
d) D = εE
e) None of the above

Ans: (d)

228. If μr is the relative permeability of a given medium, μ is a permeability and μ0 is the permeability of the free space, then the expression for μr is given by

a) μr = μ0
b) μr = μ/μ0
c) μr = μ02
d) μr = μ0
e) None of the above

Ans: (d)

229. Which of the following statement is true?

a) The current in a discharging capacitor grows exponentially
b) The current in a discharging capacitor decays exponentially
c) The current in the discharging capacitor grows linearly
d) The current in the discharging capacitor decreases constantly

Ans: (a)

230. Which of the following indicates the units of displacement density?

a) Ampere-meter
b) Coulomb-meter
c) Coulomb/m2
d) Volt m2

Ans: (c)

231.If RC is the time constant of the R-C circuit, now much time the capacitor will take to get fully charged?

a) RC seconds
b) 4 RC seconds
c) 3 RC seconds
d) 5 RC seconds

Ans: (c)

232. Find the change in potential energy of a system where change Q0 is carried to the charge Q1 at a distance of 10 meters with a 10 N force?

a) 10 N/meter
b) 100 N-meter
c) 10 joules
d) 50 N/meter

Ans: (b)

233. Which of the following phenomenon takes place when an electromagnetic wave propagates through free space?

a) Reflection
b) Phase shift
c) Attenuation
d) Distortion

Ans: (c)

234. Which of the following value is the intrinsic impedance of free space?

a) 100 Ω
b) 50 Ω
c) 317 Ω
d) 377 Ω
e) 370 Ω
f) 277 Ω

Ans: (d)

235. The resultant magnetic flux generated in the closed surface will be

a) Zero
b) Continuous
c) Constant
d) Unity

Ans: (a)

236.If the current in induction coil varies from 10 A to 20 A in one second and induces the voltage of 100 V, what will be the inductance of coil?

a) 10 H
b) 10 μH
c) 5 H
d) 1 H
e) 10 mH
f) 100 H

Ans: (a)

237. What will happen if electromagnetic wave is falling on a perfect dielectric?

a) The wave will be transmitted completely
b) The wave will be partially reflected and partly transmitted
c) The wave will be completely refracted
d) The wave will be partially absorbed

Ans: (b)

238. Which of the following gives the rate of energy flow?

a) Maxwell equation
b) Pointing vector
c) Poisson vector
d) Newton’s laws

Ans: (b)

239.The quality factor of an induction coil can be increased if

a) The length of the wire is increased
b) The diameter of wire decreased
c) The length of the wire is decreased

Ans: ()

240. Which of the following is normally designed for high value of quality factor?

a) Resistance
b) Inductance
c) Capacitance
d) None of the above

Ans: (b)

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