Gr 11 Physical Sciences: Ch 8 Sum Electromagnetism
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Questions and Answers

What is generated by an electric current flowing through a wire?

  • A thermal field
  • An electric field
  • A magnetic field (correct)
  • A gravitational field

What is the direction of the magnetic field lines produced by a current-carrying wire?

  • Diagonal to the direction of the current flow
  • Opposite to the direction of the current flow
  • Parallel to the direction of the current flow
  • Perpendicular to the direction of the current flow (correct)

What is the shape of the magnetic field lines around a current-carrying wire?

  • Concentric squares
  • Concentric rectangles
  • Concentric circles (correct)
  • Concentric triangles

What is the Right Hand Rule used to determine?

<p>The direction of the magnetic field (B)</p> Signup and view all the answers

How does the strength of the magnetic field relate to the current?

<p>It is directly proportional to the current (B)</p> Signup and view all the answers

What is represented by the symbol ( \odot ) in visualizing magnetic fields?

<p>An arrow coming out of the page (D)</p> Signup and view all the answers

What happens to the magnetic field lines as you move closer to the wire?

<p>They become stronger (A)</p> Signup and view all the answers

What is observed when a compass is placed near a current-carrying wire?

<p>The compass needle is deflected by the wire (B)</p> Signup and view all the answers

What is the shape of the magnetic field around a straight wire?

<p>Concentric circles (B)</p> Signup and view all the answers

What is the direction of the magnetic field emerging from a loop of wire according to the Right Hand Rule?

<p>In the direction of your thumb (C)</p> Signup and view all the answers

What is the characteristic of the magnetic field inside a solenoid?

<p>Stronger and uniform (D)</p> Signup and view all the answers

What is the purpose of electromagnets?

<p>To maximize the magnetic field strength (B)</p> Signup and view all the answers

Why are power lines a threat to certain bird species?

<p>Because they are not visible to birds (C)</p> Signup and view all the answers

What is the frequency of the magnetic fields generated by power lines?

<p>Low frequency (D)</p> Signup and view all the answers

What is the principle of electromagnetic induction discovered by Michael Faraday?

<p>A moving magnet induces a voltage (A)</p> Signup and view all the answers

What is the unit of magnetic flux?

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

What is the angle between the magnetic field and the normal to the loop of area A in the formula for magnetic flux?

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

What is the condition for a magnetic field to induce a current in a loop?

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

What is the direction of the induced emf in a loop according to Faraday's Law of Electromagnetic Induction?

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

What is the relationship between the induced emf and the rate of change of magnetic flux in Faraday's Law of Electromagnetic Induction?

<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 Right Hand Rule in Faraday's Law of Electromagnetic Induction?

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

What is the application of electromagnetic induction in electrical generators?

<p>Converting mechanical energy into electrical energy (D)</p> Signup and view all the answers

What is the principle behind self-induction?

<p>A changing magnetic field induces a voltage along the same wire (A)</p> Signup and view all the answers

What is the purpose of Lenz's Law?

<p>To ensure 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 is the formula for the magnetic flux through a loop?

<p>= B * A (A)</p> Signup and view all the answers

What is the effect of an approaching south pole of a magnet on a loop?

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

What is the direction of the induced current in a loop when a south pole of a magnet approaches the loop?

<p>The current flows in a direction that opposes the south pole (D)</p> Signup and view all the answers

What is the purpose of Lenz's Law?

<p>To ensure that the induced current opposes the change in magnetic flux (D)</p> Signup and view all the answers

What is the relationship between the number of turns in a loop and the induced emf?

<p>The induced emf is directly proportional to the number of turns (B)</p> Signup and view all the answers

What is the application of electromagnetic induction in electrical generators?

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

What happens to the direction of the magnetic field lines when the direction of the current flow changes?

<p>The direction of the magnetic field lines reverses (D)</p> Signup and view all the answers

What is the relationship between the strength of the magnetic field and the distance from the wire?

<p>The strength of the magnetic field decreases with distance from the wire (A)</p> Signup and view all the answers

What is the principle behind self-induction?

<p>A changing magnetic field induces a voltage along the same wire (D)</p> Signup and view all the answers

What is the formula for the induced emf in a loop?

<p>E = -N Δφ / Δt (C)</p> Signup and view all the answers

When visualizing the magnetic field from the side, what do the circles representing the magnetic field lines appear to do?

<p>They appear to come out of the page on one side and go into the page on the other side (A)</p> Signup and view all the answers

What happens to the magnetic flux when a south pole of a magnet moves away from a loop?

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

What is the orientation of the magnetic field lines produced by a current-carrying wire?

<p>They are perpendicular to the direction of the current flow (D)</p> Signup and view all the answers

What is the purpose of the Right Hand Rule in determining the direction of the magnetic field?

<p>To determine the orientation of the magnetic field lines (B)</p> Signup and view all the answers

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

<p>The current flows in a direction that opposes the change in magnetic flux (A)</p> Signup and view all the answers

What happens to the magnetic field lines when the current through the wire increases?

<p>The magnetic field lines become stronger and denser (D)</p> Signup and view all the answers

What is the shape of the magnetic field lines around a current-carrying wire when viewed from above?

<p>Concentric circles (D)</p> Signup and view all the answers

What is the symbol used to represent an arrow coming out of the page when visualizing magnetic fields?

<p>( \odot ) (C)</p> Signup and view all the answers

Which of the following does not describe the magnetic field around a straight wire?

<p>Magnetic field lines that are parallel to the wire (A), A pattern that converges through the wire (B)</p> Signup and view all the answers

What is the characteristic of the magnetic field inside a solenoid?

<p>Uniform and strong (D)</p> Signup and view all the answers

What is the purpose of markers installed on power lines?

<p>To make the power lines more visible to birds (C)</p> Signup and view all the answers

What is the condition for a magnetic field to induce a voltage in a wire?

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

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

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

What is the direction of the magnetic field lines emerging from a loop of wire according to the Right Hand Rule?

<p>In the direction of the thumb (D)</p> Signup and view all the answers

What is the primary purpose of electromagnets?

<p>To maximize the magnetic field strength (D)</p> Signup and view all the answers

What is the relationship between the magnetic field strength and the current in a wire?

<p>The magnetic field strength is directly proportional to the current (D)</p> Signup and view all the answers

What is the significance of Faraday's Law of Electromagnetic Induction?

<p>It describes how a changing magnetic field induces a voltage (B)</p> Signup and view all the answers

What is the effect of a magnetic field parallel to the surface of a loop on the magnetic flux?

<p>It has no effect on the magnetic flux (D)</p> Signup and view all the answers

What is the primary reason for the magnetic field lines being denser inside a loop of wire?

<p>The magnetic field lines converge through the loop (A)</p> Signup and view all the answers

What is the effect of increasing the number of turns in a solenoid on the magnetic field strength?

<p>The magnetic field strength increases proportionally to the number of turns (A)</p> Signup and view all the answers

What is the purpose of studying the magnetic flux through a loop?

<p>To understand the principle of electromagnetic induction (A)</p> Signup and view all the answers

What happens to the magnetic field around a wire when the direction of the current flow changes?

<p>The magnetic field direction reverses (A)</p> Signup and view all the answers

What is the primary concern regarding power lines and their impact on the environment?

<p>The power lines are a threat to certain bird species (A)</p> Signup and view all the answers

What is the condition required for a changing magnetic field to induce a voltage in a wire?

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

What is the purpose of the Right Hand Rule in relation to electromagnetic induction?

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

What is the relationship between the magnetic flux and the area of the loop?

<p>The magnetic flux is directly proportional to the area of the loop (C)</p> Signup and view all the answers

What is the primary application of electromagnetic induction in electrical systems?

<p>Generation of electricity (D)</p> Signup and view all the answers

What is the effect of increasing the distance from the wire on the magnetic field strength?

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

What is the reason for the deflection of a compass needle when placed near a current-carrying wire?

<p>The magnetic field lines are perpendicular to the direction of the current flow. (A)</p> Signup and view all the answers

What is the orientation of the magnetic field lines when viewing the current-carrying wire from above?

<p>Concentric circles around the wire. (D)</p> Signup and view all the answers

What is the relationship between the strength of the magnetic field and the distance from the wire?

<p>The strength of the magnetic field decreases as the distance from the wire increases. (D)</p> Signup and view all the answers

What is the purpose of the Right Hand Rule in determining the direction of the magnetic field?

<p>To determine the direction of the magnetic field. (C)</p> Signup and view all the answers

What happens to the magnetic field lines when the current through the wire increases?

<p>The magnetic field lines become stronger. (D)</p> Signup and view all the answers

What is the symbol used to represent an arrow going into the page when visualizing magnetic fields?

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

What is the shape of the magnetic field lines when viewed from the side?

<p>Edge-on circles. (D)</p> Signup and view all the answers

What is the relationship between the magnetic field strength and the current in a wire?

<p>The magnetic field strength is proportional to the current. (A)</p> Signup and view all the answers

What is the proportionality constant between the induced emf and the rate of change of magnetic flux in Faraday's Law of Electromagnetic Induction?

<p>N (D)</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 opposition to the change in magnetic flux (C)</p> Signup and view all the answers

What is the effect on the induced current in a solenoid when the south pole of a magnet moves away from the solenoid?

<p>The induced current direction changes (C)</p> Signup and view all the answers

What is the principle behind the generation of electrical energy in a generator?

<p>Faraday's Law of Electromagnetic Induction (D)</p> Signup and view all the answers

What is the direction of the induced current in a loop when a north pole of a magnet approaches the loop?

<p>Opposite to the magnetic field (C)</p> Signup and view all the answers

What is the effect on the magnetic flux when a coil is rotated in a uniform magnetic field?

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

What is the relationship between the number of turns in a loop and the induced emf?

<p>The induced emf is proportional to the number of turns (A)</p> Signup and view all the answers

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

<p>To ensure the direction of the induced current opposes the change in magnetic flux (B)</p> Signup and view all the answers

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