Right Hand Rule
What does your right-hand thumb represent in the magnetic force right-hand rule for a current-carrying wire?
Hint: It points to what the wire actually experiences in the field.
What is the direction of the magnetic force?
What two things must be present for a magnetic force to act on a charge?
Hint: Consider the equation for magnetic force.
What is a moving charge and a magnetic field?
In uniform circular motion of a charged particle in a magnetic field, the magnetic force is always directed toward what?
Hint: Think of centripetal force.
What is the center of the circular path?
What is the SI unit for Current
Hint: coulomb/second
What is Amp?
What is the direction of the magnetic field inside a solenoid?
Hint: What is the direction your right-hand thumb points when you grip the solenoid?
What is along the axis toward the north end of the solenoid?
A wire carries current north while the magnetic force on it is east. What direction is the magnetic field?
Hint: Don't confuse this with the right-hand thumb rule.
What is into the page?
A charged particle moves parallel to a magnetic field. What magnetic force acts on it?
Hint: What is sin(0°)?
What is zero magnetic force?
A charged particle moves parallel to a uniform magnetic field. What path does it follow?
Hint: Consider the angle between velocity and magnetic field.
What is a straight-line path?
This law states that the magnetic field created by an electric current is directly proportional to the magnitude of that current.
Hint: It is named after the physicist who died of pneumonia at the age of 61.
What is Ampere’s Law
What happens to the magnetic field when a long wire is coiled into a solenoid?
Hint: Think about what happens when many loop magnetic fields overlap.
What is the field becomes stronger and more uniform inside?
An electron moves upward through a magnetic field pointing left. What direction is the magnetic force?
Hint: Reverse the right-hand-rule result because the charge is negative.
What is out of the page?
Two parallel wires carry equal current in opposite directions. What is the nature of the force between them and why?
Hint: Use the Right Hand Rule
What is repulsive? This is due to the magnetic field from one wire exerts a force on the current of the other wire, pointing away from it, via the Right-Hand Rule.
A proton enters a uniform magnetic field with both parallel at an angle. Describe its motion.
Hint: Consider the fact that there are parallel and perpendicular velocity components.
What is helical motion around the magnetic field lines?
A long straight wire carries a current of 12 A. What is the magnetic field strength 0.20 m away from the wire?
Hint: The magnetic field is proportional to current and inversely proportional to distance.
What is 1.2x10^-5T?
Why is the magnetic field inside a solenoid much stronger than outside?
Hint: What happens when individual loop magnetic fields combine inside the coil?
What is many loops contribute fields in the same direction, adding constructively inside?
A proton enters a magnetic field and begins curving clockwise when viewed from above. What is the direction of the magnetic field?
Hint: A proton curves because the magnetic force is always perpendicular to its motion.
What is downward?
A proton enters a magnetic field at an angle. Which component of its velocity changes due to the magnetic force?
Hint: Think about what happens when a charged particle moves exactly parallel to a magnetic field.
What is perpendicular to the magnetic field?
A proton enters a uniform magnetic field at an angle, producing helical motion. If the magnetic field strength doubles while the proton’s speed remains constant, what happens to the radius of the helix?
Hint: The magnetic field only affects the perpendicular component of motion.
What is the radius decreases?
A square loop of wire carries current clockwise and is placed in a uniform magnetic field pointing to the right. What is the direction of the net torque/motion on the loop?
Hint: Think about the forces the opposite sides of the loop experience.
What is counterclockwise from the front?
A solenoid has 200 turns and a length of 0.50 m. It carries a current of 0.80 A. What is the magnitude of the magnetic field inside the solenoid?
Hint: What is the magnetic field proportional to?
What is 4.02x10^-4 T?
A proton enters a uniform magnetic field pointing north. Its initial velocity has two components: eastward and northward. Describe the resulting motion of the particle.
Hint: One component of velocity is unaffected by the magnetic force, while the other causes circular motion.
What is helical motion around the northward magnetic field direction?
A proton enters a region of uniform magnetic field with velocity perpendicular to the field and moves in a circular path. The magnetic field strength is doubled while the proton’s speed remains unchanged. What happens to the radius of the path?
Hint: The magnetic force is equal to the centripetal force
What is halves?
A proton and an electron enter the same uniform magnetic field with equal speeds perpendicular to the field. Compare the direction of their motion and the size of their circular paths.
Hint: The magnetic force depends on the sign of the charge, while the radius depends on mass.
What is they curve in opposite directions, and the proton follows the larger circular path?
Two insulated current-carrying wires cross at their midpoints without touching. Wire A carries current north, while Wire B carries current east. Describe the net magnetic force on the wires.
Hint: Consider how the magnetic forces vary along different parts of each wire.
What is zero?
A current-carrying loop is placed in a uniform magnetic field. The plane of the loop is parallel to the field direction. What happens to the loop and why?
Hint: Think about forces on opposite sides of the loop and how they interact.
What is the loop experiences a torque and begins to rotate because opposite sides experience equal and opposite magnetic forces that do not cancel?