Magnetism & EMI

Q. What is the phenomenon called when a changing magnetic field induces an electric current in a conductor?
  • A. Electromagnetic induction
  • B. Electrolysis
  • C. Magnetic resonance
  • D. Thermal conduction
Q. What is the phenomenon called when a changing magnetic field induces an electromotive force (EMF) in a conductor?
  • A. Electromagnetic induction
  • B. Magnetic resonance
  • C. Electrolysis
  • D. Magnetization
Q. What is the phenomenon called when a changing magnetic field induces an electromotive force (EMF) in a circuit?
  • A. Electromagnetic induction
  • B. Magnetic resonance
  • C. Electrolysis
  • D. Magnetization
Q. What is the phenomenon called when a conductor moves through a magnetic field and generates an electric current?
  • A. Electromagnetic induction
  • B. Magnetic hysteresis
  • C. Electrostatic induction
  • D. Magnetic flux
Q. What is the phenomenon of electromagnetic induction?
  • A. The generation of electric current by a changing magnetic field
  • B. The generation of magnetic field by a changing electric current
  • C. The interaction between electric and magnetic fields
  • D. The conversion of mechanical energy into electrical energy
Q. What is the power factor in a circuit with a phase angle of 60 degrees?
  • A. 0.5
  • B. 0.866
  • C. 1
  • D. 0
Q. What is the power factor of a circuit with a phase angle of 60 degrees?
  • A. 0.5
  • B. 0.866
  • C. 1
  • D. 0.707
Q. What is the power factor of an AC circuit with a phase angle of 60 degrees?
  • A. 0.5
  • B. 0.866
  • C. 1
  • D. 0.707
Q. What is the primary reason for the operation of an electric motor?
  • A. Electromagnetic induction
  • B. Lorentz force
  • C. Coulomb's law
  • D. Ohm's law
Q. What is the principle behind electromagnetic induction?
  • A. Magnetic fields can create electric fields
  • B. Electric fields can create magnetic fields
  • C. Both A and B
  • D. None of the above
Q. What is the principle behind the operation of an electric generator?
  • A. Electromagnetic induction
  • B. Thermal expansion
  • C. Photoelectric effect
  • D. Chemical reaction
Q. What is the principle behind the operation of an electric motor?
  • A. Electromagnetic induction
  • B. Lorentz force
  • C. Magnetic resonance
  • D. Thermal expansion
Q. What is the principle behind the working of an electric generator?
  • A. Electromagnetic induction
  • B. Electrolysis
  • C. Thermal expansion
  • D. Photoelectric effect
Q. What is the principle behind the working of an electric motor?
  • A. Electromagnetic induction
  • B. Lorentz force
  • C. Magnetic resonance
  • D. Electrolysis
Q. What is the relationship between current and magnetic field in a long straight conductor?
  • A. Directly proportional
  • B. Inversely proportional
  • C. Independent
  • D. Exponential
Q. What is the relationship between the magnetic field and the distance from a long straight wire carrying current?
  • A. Directly proportional
  • B. Inversely proportional
  • C. Independent
  • D. Exponential
Q. What is the relationship between the magnetic field and the enclosed current according to Ampere's Law?
  • A. B is proportional to the square of the current
  • B. B is inversely proportional to the current
  • C. B is directly proportional to the current
  • D. B is independent of the current
Q. What is the right-hand rule used for in magnetism?
  • A. To determine the direction of current
  • B. To find the direction of magnetic field
  • C. To find the direction of force on a charge
  • D. All of the above
Q. What is the RMS value of an AC voltage given by V(t) = V0 sin(ωt)?
  • A. V0
  • B. V0/√2
  • C. V0√2
  • D. 0
Q. What is the role of a commutator in a DC motor?
  • A. To convert AC to DC
  • B. To reverse the direction of current
  • C. To increase voltage
  • D. To decrease resistance
Q. What is the root mean square (RMS) value of an alternating current (AC) if its peak value is 10 A?
  • A. 5 A
  • B. 7.07 A
  • C. 10 A
  • D. 14.14 A
Q. What is the root mean square (RMS) value of an alternating current (AC) that has a peak value of 10 A?
  • A. 5 A
  • B. 7.07 A
  • C. 10 A
  • D. 14.14 A
Q. What is the shape of the magnetic field lines around a bar magnet?
  • A. Straight lines
  • B. Concentric circles
  • C. Closed loops
  • D. Random
Q. What is the shape of the magnetic field lines around a long straight conductor carrying current?
  • A. Straight lines
  • B. Concentric circles
  • C. Ellipses
  • D. Spirals
Q. What is the total energy stored in an inductor with inductance L carrying a current I?
  • A. LI^2
  • B. 0.5LI^2
  • C. I^2/L
  • D. 0.5I^2/L
Q. What is the unit of impedance in an AC circuit?
  • A. Ohm
  • B. Farad
  • C. Henry
  • D. Coulomb
Q. What is the unit of inductance?
  • A. Ohm
  • B. Henry
  • C. Farad
  • D. Coulomb
Q. What is the unit of magnetic field strength (B)?
  • A. Tesla
  • B. Weber
  • C. Henry
  • D. Ampere
Q. What is the unit of magnetic field strength as defined by the Biot-Savart Law?
  • A. Tesla
  • B. Newton
  • C. Coulomb
  • D. Ampere
Q. What is the unit of magnetic field strength as derived from Biot-Savart Law?
  • A. Tesla
  • B. Ampere
  • C. Weber
  • D. Henry
Showing 361 to 390 of 418 (14 Pages)
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