Magnetic Fields

What is the unit for magnetic field strength?

• Watt

• Joule

• Ohm

• Tesla

In which direction do magnetic field lines point away from?

• West pole

• South pole

• East pole

• North pole

What is the formula for the force experienced by a moving charge in a magnetic field?

• F=qvBsecθ

• F=qvBsinθ

• F=qvBtanθ

• F=qvBcosθ

What is the formula for the radius of the circular path of a charged particle moving in a magnetic field?

• r=mvB/q

• r=mvq/B

• r=mv/B

• r=mv/qB

What is the formula for the magnetic force acting on a current-carrying wire in a magnetic field?

• F = ILBsinθ

• F = ILBcosθ

• F = ILBtanθ

• F = ILBsecθ

A current carrying conductor is placed in a uniform magnetic field. Which diagram shows the correct direction of magnetic force on the conductor?

• 
• 
• 
• 

• X: Out Y: Out. Z. Out

• X: Out Y: In Z. In

• X: In Y: In Z. In

• X: In Y: Out. Z. Out

• 1.5 A to the right

• 1.5 A to the left

• 3.0 A to the right

• 3.0 A to the left

An electron of speed v passes undeflected through a chamber of magnetic field, B and electric field, E perpendicular to each other. Which statement below is true?

• v = B/E

• v = E/B

• Electric force > Magnetic force

• Magnetic force > Electric force

What is the Hall voltage directly proportional to?

• Charge

• Magnetic flux density

• Thickness of semiconductor

• Charge carrier density