Electric and Magnetic fields December 7, 2023 Contents Results - #1. What is the SI unit of electric field strength? Joule Joule Volt Volt Newton/Coulomb Newton/Coulomb Coulomb Coulomb #2. Electric field lines always point in the direction of: Positive charges Positive charges Negative charges Negative charges Both positive and negative charges Both positive and negative charges Neither positive nor negative charges Neither positive nor negative charges #3. What is the electric field at a point in space? The force experienced by a charged particle at that point The force experienced by a charged particle at that point The potential energy of a charged particle at that point The potential energy of a charged particle at that point The charge at that point The charge at that point The potential difference at that point The potential difference at that point #4. How is the direction of the electric field defined? Away from positive charges and towards negative charges Away from positive charges and towards negative charges Away from negative charges and towards positive charges Away from negative charges and towards positive charges Always pointing towards positive charges Always pointing towards positive charges Always pointing towards negative charges Always pointing towards negative charges #5. The SI unit of electric field is: Newton per coulomb Newton per coulomb Volt per meter Volt per meter Coulomb per volt Coulomb per volt Tesla per coulomb Tesla per coulomb #6. If a positive charge is placed in an electric field, in which direction will it experience a force? Opposite to the direction of the electric field Opposite to the direction of the electric field In the same direction as the electric field In the same direction as the electric field Perpendicular to the electric field Perpendicular to the electric field No force will be experienced No force will be experienced #7. How does the electric field strength between two charged plates change if the distance between the plates is increased? Increases Increases Decreases Decreases Remains the same Remains the same Becomes zero Becomes zero #8. Which of the following materials is a good conductor of electricity? Rubber Rubber Glass Glass Copper Copper Wood Wood #9. What is the SI unit of magnetic field strength? Tesla Tesla Weber Weber Ampere Ampere Gauss Gauss #10. What is the SI unit of magnetic flux? Tesla Tesla Weber Weber Ampere Ampere Gauss Gauss #11. According to Ampere's Law, the magnetic field around a closed loop is proportional to: Electric current passing through the loop Electric current passing through the loop Voltage across the loop Voltage across the loop Resistance of the loop Resistance of the loop Time elapsed since the loop was formed Time elapsed since the loop was formed #12. What is the magnetic pole that acts as the north-seeking pole of a magnet? North pole North pole South pole South pole Both poles Both poles Neither pole Neither pole #13. Which material is typically used as a core in electromagnets to enhance their magnetic field strength? Aluminium Aluminium Copper Copper Iron Iron d). Silver d). Silver #14. The phenomenon of a temporary increase in the magnetic strength of a material when placed in a magnetic field is called: Magnetization Magnetization Demagnetization Demagnetization Induction Induction Flux Flux #15. What happens to the magnetic field strength as you move away from a permanent magnet? Increases Increases Decreases Decreases Remains constant Remains constant Varies unpredictably Varies unpredictably #16. In which of the following materials is the permeability the highest, making it an excellent magnetic shield? Air Air Wood Wood Iron Iron Copper Copper #17. According to Faraday's Law of Electromagnetic Induction, the induced electromotive force (EMF) is proportional to: Magnetic field strength Magnetic field strength Time Time Rate of change of magnetic flux Rate of change of magnetic flux Resistance Resistance #18. The phenomenon of a changing magnetic field inducing an electric current is described by: Coulomb's Law Coulomb's Law Faraday's Law of Electromagnetic Induction Faraday's Law of Electromagnetic Induction Ampere's Law Ampere's Law Gauss's Law for Electricity Gauss's Law for Electricity #19. The speed of electromagnetic waves (such as light) is determined by: Electric field strength Electric field strength Magnetic field strength Magnetic field strength Both electric and magnetic field strengths Both electric and magnetic field strengths Permittivity of the medium Permittivity of the medium #20. In electromagnetic waves, the electric field and magnetic field are: Perpendicular to each other and both are perpendicular to the direction of propagation Perpendicular to each other and both are perpendicular to the direction of propagation Parallel to each other and both are parallel to the direction of propagation Parallel to each other and both are parallel to the direction of propagation Perpendicular to each other, but one is parallel to the direction of propagation Perpendicular to each other, but one is parallel to the direction of propagation Parallel to each other, but one is perpendicular to the direction of propagation Parallel to each other, but one is perpendicular to the direction of propagation Finish