Electromagnetic Induction Quiz

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Questions and Answers

What is the main factor that determines the amount of voltage produced in electromagnetic induction?

  • The shape of the wire
  • The speed of movement (correct)
  • The material of the wire
  • The strength of the magnet

What is the formula for the magnetic field strength?

  • Ф = BAsec θ
  • Ф = BAcot θ
  • Ф = BAcos θ (correct)
  • Ф = BAtan θ

What is the direction of the induced voltage in a coil according to Faraday's Law?

  • Parallel to the magnetic field
  • Perpendicular to the magnetic field (correct)
  • Opposite to the magnetic field
  • In the same direction as the magnetic field

What is the relationship between the change in magnetic flux and the emf induced in a coil?

<p>Emf is directly proportional to the change in flux (B)</p> Signup and view all the answers

What is the condition for inducing a voltage in a conductor according to electromagnetic induction?

<p>The magnetic field must be changing (D)</p> Signup and view all the answers

What is the effect of the material of the conductor on the induced voltage?

<p>The induced voltage is higher for materials with loosely bound electrons (C)</p> Signup and view all the answers

What is the relationship between the change in time ∆t and the emf?

<p>emf is inversely proportional to ∆t (C)</p> Signup and view all the answers

How does the number of turns N affect the induced emf?

<p>The emf is directly proportional to N (C)</p> Signup and view all the answers

In the given example, what is the change in flux ΔΦ?

<p>(1.13 x 10^-2m^2)(0.200 T) (A)</p> Signup and view all the answers

What is the unit of the area of the loop A?

<p>m^2 (C)</p> Signup and view all the answers

What is the average value of B cos θ in the given example?

<p>0.200 T (A)</p> Signup and view all the answers

What is the emf induced in the coil when a magnetic field of 0.200 T is changed at a rate of 1.13 x 10-2m2/s?

<p>22.6mV (A)</p> Signup and view all the answers

What happens when the voltage source is turned on in a transformer?

<p>Current briefly surges through the secondary coil (C)</p> Signup and view all the answers

What is the purpose of connecting an AC voltage source to a transformer?

<p>To change the rate at which the magnetic field changes (D)</p> Signup and view all the answers

What happens to the voltage in a transformer when the number of turns in the secondary coil is greater than in the primary coil?

<p>The voltage is stepped up (C)</p> Signup and view all the answers

What is the direction of the induced current in the secondary coil when the voltage source is turned off?

<p>In the opposite direction (B)</p> Signup and view all the answers

Who stated that a magnetic field is created in any region of space where an electric field is changing with time?

<p>Maxwell (A)</p> Signup and view all the answers

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