An E.M.F. can be induced by _________(a) Change in the magnetic field only(b) Change in the area of cross section only(c) Change in angle between magnetic field and area only(d) Change in the magnetic field, area or angle between themI had been asked this question in semester exam.This intriguing question comes from Electromagnetic Induction in section Electromagnetism of Basic Electrical Engineering

An E.M.F. can be induced by _________(a) Change in the magnetic field

1.	An E.M.F. can be induced by _________(a) Change in the magnetic field only(b) Change in the area of cross section only(c) Change in angle between magnetic field and area only(d) Change in the magnetic field, area or angle between themI had been asked this question in semester exam.This intriguing question comes from Electromagnetic Induction in section Electromagnetism of Basic Electrical Engineering
Answer» The correct option is (d) CHANGE in the magnetic field, area or ANGLE between them Explanation: emf=-dϕ/dt. We know ϕ FLUX is the dot PRODUCT of magnetic field vector and area vector. ϕ=BAcos(θ), hence if either of the three, that is, magnetic field, area or angle changes, the emf will change, flux changes due to which emf can be induced.

Discussion

No Comment Found

Related InterviewSolutions

What is the consequence of motor effect?(a) Current(b) Voltage(c) Electromagnetic induction(d) EMFI had been asked this question during an internship interview.The origin of the question is Electromagnetic Induction topic in division Electromagnetism of Basic Electrical Engineering
Force in a conductor is__________ to the product of the charges.(a) Directly proportional(b) Inversely proportional(c) Not related(d) Cannot be determinedThis question was addressed to me in final exam.This question is from Force on a Current Carrying Conductor topic in chapter Electromagnetism of Basic Electrical Engineering
Which, among the following qualities, is not affected by the magnetic field?(a) Moving charge(b) Change in magnetic flux(c) Current flowing in a conductor(d) Stationary chargeI have been asked this question at a job interview.Asked question is from Magnetic Field topic in chapter Electromagnetism of Basic Electrical Engineering
“The direction of an induced e.m.f. is always such that it tends to set up a current opposing the motion or the change of flux responsible for inducing that e.m.f.”, this is the statement for?(a) Fleming’s left hand rule(b) Fleming’s right hand rule(c) Faraday’s law(d) Lenz’s lawI have been asked this question in examination.My query is from Direction of Induced EMF in portion Electromagnetism of Basic Electrical Engineering
North pole induces __________(a) Clockwise current(b) Anti-clockwise current(c) Zero current(d) Infinite currentI have been asked this question in a national level competition.Asked question is from Magnitude of the Generated or Induced EMF topic in division Electromagnetism of Basic Electrical Engineering
Find the strength of the magnetic field in a conductor 0.5m long moving with a velocity of 10m/s, inducing an emf of 20V if magnetic field, velocity and length of conductor are mutually perpendicular to each other.(a) 1T(b) 2T(c) 3T(d) 4TI got this question in an interview.I want to ask this question from Electromagnetic Induction topic in portion Electromagnetism of Basic Electrical Engineering
Which among the following, is the correct expression for force in a current carrying conductor if magnetic field is perpendicular to it?(a) F=Bi(b) F=B^2il(c) F=Bil(d) F=Bl^2I had been asked this question in final exam.The above asked question is from Force Determination in portion Electromagnetism of Basic Electrical Engineering
The current in a solenoid is 30A, the number of turns per unit length is 500 turns per metre. Calculate the magnetic field if the core is air.(a) 18.84T(b) 18.84mT(c) 1.84T(d) 1.84mTThe question was asked in an internship interview.This intriguing question originated from Magnetic Field of a Solenoid in chapter Electromagnetism of Basic Electrical Engineering
The force existing between two infinite parallel conductors is inversely proportional to ________(a) Radius of the conductors(b) Current in one of the conductors(c) The product of the current in the two conductors(d) The distance between the two conductorsThis question was posed to me at a job interview.The doubt is from Magnetic Field Due to an Electric Current in chapter Electromagnetism of Basic Electrical Engineering
According to Flemming’s left hand rule, the thumb denotes?(a) Direction of magnetic field(b) Direction of current(c) Direction of force(d) Direction of force as well as currentI got this question in my homework.This interesting question is from Direction of Magnetic Field topic in division Electromagnetism of Basic Electrical Engineering

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment