Physics 51 Module 11: Electric Charge and Electric Field

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Questions and Answers

What is electric charge?

  • A physical property carried by certain subatomic particles (correct)
  • A characteristic that is only present in metals
  • A force that acts between two objects
  • A type of electromagnetic wave

What is the principle of superposition in relation to electric charge?

  • The total charge in an isolated system is always zero
  • The total charge in an isolated system is always conserved (correct)
  • The total charge in an isolated system is always positive
  • The total charge in an isolated system is always negative

What is the property of electric charge known as quantization of charge?

  • The magnitude of the charge of an electron is random
  • The magnitude of the charge of an electron is zero
  • The magnitude of the charge of an electron is a natural unit of charge (correct)
  • The magnitude of the charge of an electron is infinite

What is the direction of the electric field of a positive point charge?

<p>Away from the charge (C)</p> Signup and view all the answers

What is the unit of electric field magnitude?

<p>1 N/C (B)</p> Signup and view all the answers

Why do atoms normally not have an overall charge?

<p>Because their positive and negative charges cancel each other out (D)</p> Signup and view all the answers

What is a conductor in relation to electric charge?

<p>A material that permits electric charge to move freely through it (A)</p> Signup and view all the answers

What is Coulomb's Law related to?

<p>The magnitude of the electric force between two point charges (D)</p> Signup and view all the answers

What is the electric force on a charged body exerted by?

<p>The electric field created by other charged bodies (B)</p> Signup and view all the answers

What happens when electrons move away from an atom?

<p>The atom gains or loses a charge (B)</p> Signup and view all the answers

What does the length of the vectors in a vector representation of an electric field indicate?

<p>The magnitude of the field (C)</p> Signup and view all the answers

What does the distance between field lines in a lines-of-force representation indicate?

<p>The magnitude of the field (D)</p> Signup and view all the answers

What is the direction of the force exerted by q2 on qa?

<p>Attractive and makes an angle of 45° (A)</p> Signup and view all the answers

What is the net force on qa?

<p>4.5 N (A)</p> Signup and view all the answers

What is the electric field at a point halfway between two point charges?

<p>3.60 x 10^6 N/C directed to the -x-axis (B)</p> Signup and view all the answers

What is the force exerted on a third charge placed at the midpoint between two point charges?

<p>Depends on the magnitude of the third charge (C)</p> Signup and view all the answers

What is the distance between the two point charges?

<p>1.00 m (D)</p> Signup and view all the answers

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