Gr 11 Physical Sciences: Ch 8.2 Faraday’s law of electromagnetic induction

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Questions and Answers

What is the name of the law that describes the principle of electromagnetic induction?

  • Gauss's Law of Electromagnetic Induction
  • Lenz's Law of Electromagnetic Induction
  • Newton's Law of Electromagnetic Induction
  • Faraday's Law of Electromagnetic Induction (correct)

What is the unit of magnetic flux?

  • Weber (correct)
  • Tesla
  • Ampere
  • Henry

What is the angle between the magnetic field and the normal to the loop when the magnetic flux is maximum?

  • 45 degrees
  • 180 degrees
  • 90 degrees
  • 0 degrees (correct)

What happens to the induced emf when the magnetic field is parallel to the surface?

<p>It becomes zero (B)</p> Signup and view all the answers

What is the relationship between the induced emf and the rate of change of magnetic flux?

<p>The induced emf is directly proportional to the rate of change of magnetic flux (B)</p> Signup and view all the answers

What is the purpose of the minus sign in Faraday's Law of Electromagnetic Induction?

<p>To indicate the direction of the induced emf (A)</p> Signup and view all the answers

What is the direction of the induced current in a conductor?

<p>Opposite to the direction of the change in magnetic flux (B)</p> Signup and view all the answers

What is the condition for inducing a voltage in a wire?

<p>The magnet must be moving (C)</p> Signup and view all the answers

What happens when a south pole of a magnet approaches a loop?

<p>The induced emf generates a current that produces a magnetic field opposing the increase in the magnetic field strength (A)</p> Signup and view all the answers

In a solenoid, how is the magnetic flux calculated?

<p>By multiplying the cross-sectional area by the number of loops (B)</p> Signup and view all the answers

What is the principle behind electromagnetic induction?

<p>The changing magnetic field induces a current (B)</p> Signup and view all the answers

What is self-induction?

<p>When a changing magnetic field produced by a changing current in a wire induces a voltage along the same wire (D)</p> Signup and view all the answers

What does Lenz's Law state?

<p>The induced current will create a magnetic field that opposes the change in the magnetic flux (D)</p> Signup and view all the answers

What happens when the south pole of a magnet recedes from a loop?

<p>The induced current generates a magnetic field that attracts the south pole (B)</p> Signup and view all the answers

What is the purpose of the Right Hand Rule?

<p>To determine the direction of the induced current (C)</p> Signup and view all the answers

What is the main application of electromagnetic induction?

<p>Electrical generators (B)</p> Signup and view all the answers

What is the cause of the induced emf in a wire?

<p>A changing magnetic field near the wire (B)</p> Signup and view all the answers

What is the direction of the magnetic field generated by the induced current when a south pole of a magnet approaches a loop?

<p>Opposite the direction of the south pole's field (D)</p> Signup and view all the answers

What is the magnetic flux through a loop of area A in the presence of a uniform magnetic field B?

<p>φ = B A cos θ (C)</p> Signup and view all the answers

What is the purpose of the induced current in a solenoid when a magnetic field is changing?

<p>To oppose the change in the magnetic field strength (A)</p> Signup and view all the answers

What is the effect of self-induction in a wire?

<p>It generates a voltage along the same wire (A)</p> Signup and view all the answers

What is the effect of increasing the number of turns N in a loop on the induced emf?

<p>The induced emf increases (B)</p> Signup and view all the answers

What is the principle behind the operation of electrical generators?

<p>Electromagnetic induction (D)</p> Signup and view all the answers

Why does a magnetic field parallel to the surface of a loop not induce a current?

<p>Because the magnetic field does not pass through the surface (B)</p> Signup and view all the answers

What is the relationship between the induced current and the change in magnetic flux?

<p>The induced current is inversely proportional to the change in magnetic flux (A)</p> Signup and view all the answers

What is the relationship between the rate of change of magnetic flux and the induced emf?

<p>The induced emf is directly proportional to the rate of change of magnetic flux (C)</p> Signup and view all the answers

What is the role of the Right Hand Rule in determining the direction of the induced current?

<p>It helps to determine the direction of the induced current (B)</p> Signup and view all the answers

What is the purpose of the direction of the induced emf in a conductor?

<p>To oppose the change in magnetic flux (D)</p> Signup and view all the answers

What happens when a south pole of a magnet moves away from a loop?

<p>The induced current generates a magnetic field that attracts the south pole (D)</p> Signup and view all the answers

What is the effect of changing the angle θ between the magnetic field and the normal to the loop on the magnetic flux?

<p>The magnetic flux decreases with increasing θ (B)</p> Signup and view all the answers

What is the main application of electromagnetic induction?

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

What is the condition for the induced emf to be maximum?

<p>When the magnetic field is perpendicular to the surface (B)</p> Signup and view all the answers

When the magnetic field is perpendicular to the loop's area, what is the angle between the magnetic field and the normal to the loop?

<p>0° (A)</p> Signup and view all the answers

What happens to the induced emf when the loop's area is increased while the magnetic field remains constant?

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

A conductor is moving through a uniform magnetic field. What is the direction of the induced emf?

<p>Perpendicular to the direction of motion (D)</p> Signup and view all the answers

What is the effect of increasing the number of turns in a loop on the induced emf?

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

A coil is rotating in a uniform magnetic field. What is the direction of the induced current?

<p>Perpendicular to the direction of rotation (B)</p> Signup and view all the answers

What happens to the magnetic flux when the angle between the magnetic field and the normal to the loop is 45°?

<p>It becomes half (B)</p> Signup and view all the answers

A magnet is moving towards a coil. What is the direction of the magnetic field generated by the induced current?

<p>Opposite to the direction of the moving magnet (C)</p> Signup and view all the answers

What is the effect of changing the magnetic field while keeping the loop's area constant?

<p>The magnetic flux decreases (B)</p> Signup and view all the answers

What is the purpose of the induced current in a solenoid when a magnetic field is changing?

<p>To oppose the change in magnetic flux (B)</p> Signup and view all the answers

What is the direction of the magnetic field generated by the induced current when a south pole of a magnet approaches a loop?

<p>Opposite to the south pole's field (A)</p> Signup and view all the answers

What is the effect of increasing the number of turns N in a loop on the induced emf?

<p>It increases the induced emf (A)</p> Signup and view all the answers

What is the role of Lenz's Law in electromagnetic induction?

<p>It ensures that the direction of the induced emf always works to counteract the change that caused it (C)</p> Signup and view all the answers

What happens when the magnetic field is parallel to the surface of a loop?

<p>The magnetic flux is zero (C)</p> Signup and view all the answers

What is the purpose of electromagnetic induction in electrical generators?

<p>To convert mechanical energy into electrical energy (B)</p> Signup and view all the answers

What is the effect of self-induction in a wire?

<p>It generates a voltage in the opposite direction as the current (B)</p> Signup and view all the answers

What is the relationship between the rate of change of magnetic flux and the induced emf?

<p>The induced emf is proportional to the rate of change of magnetic flux (C)</p> Signup and view all the answers

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