Electromagnetism
Quiz by EUGENE MENIANO
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9 questions
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- Q1Which of the following is an example of an electromagnet?A table lampA doorbellA ladderA bicycle30s
- Q2What is the SI unit of electric current?OhmAmpereVoltWatt30s
- Q3What property of a material determines its ability to conduct electricity?Electrical conductivityColorDensityThermal conductivity30s
- Q4What causes an electromagnet to become stronger?Decreasing the current flowing through the wireIncreasing the number of coils in the wireIncreasing the length of the wireUsing a thinner wire30s
- Q5What is the phenomenon of electromagnetic induction?The production of an electric current by changing magnetic fieldThe production of a magnetic field by an electric currentThe generation of static electricity by frictionThe absorption of electromagnetic radiation by a material30s
- Q6Which of the following devices utilizes the principles of electromagnetism?A microwave ovenA blenderA toasterA loudspeaker30s
- Q7What is the purpose of a commutator in an electric motor?To cool down the motorTo reverse the direction of current flow in the coilTo increase the speed of the motorTo regulate the voltage supplied to the motor30s
- Q8What is the relationship between electric current and magnetic field in electromagnetism?Electric current and magnetic field are unrelatedElectric current produces a magnetic fieldMagnetic field produces electric currentElectric current is unaffected by magnetic field30s
- Q9What is the function of a transformer in an electrical circuit?To change the voltage of an alternating currentTo store electrical energyTo protect against electrical overloadsTo convert AC to DC30s