M6 Topic 2 Part 1 - The Motor Effect Flashcards
What is the motor effect?
When a current carrying conductor is placed in a magnetic field, causing it to experience a force.
How does the motor effect work?
The wire creates a internal magnetic field which interacts with the external field.
what is the right hand rule for a wire? (2)
- The thumb is placed in the direction of the current.
- The fingers (in a fist shape) show the direction of the circular magnetic field
what is the right hand rule for the direction of a force (3)
- Fingers (open palm) show the direction of the magnetic field
- The thumb shows the direction of the current
- The palm shows the direction of the force
How is the force on a current carrying conductor calculated?
F=BIL⊥= BILsinθ
what do the letter in F=BILsinθ mean, and what are there units (5)
F= Force on the current carrying wire B= The strength of the external magnetic field I= The current in the wire L= The length of the current carrying wire interacting with external magnetic field θ= the angle at which the current carrying wire enter the magnetic field
what is the equation for the magnetic field strength in a wire
B = μ₀l/2πr
what do all the symbols in the the magnetic field strength in a wire equation and what unit are they measured in
B = magnetic field strength μ₀ = the magnetic permeability ( 1.257 x10₋₆NA₋₂) l = the current (amperes (A)) r = the radius from the field line to the wire (m)
when will two parallel wires attract or repel one another
attract = when they have the same direction in current repel = when they have opposite direction in current
what is the force between two wires equation
F/l = (μ₀I₁I₂)/2πr
what do all the symbols in the the force between two wires equation mean and what units are they measured in
F/l = the force per unit length between the conductors (N/m)
μ₀ = the magnetic permeability ( 1.257 x10₋₆NA₋₂)
I₁ the current in wire 1 (A)
I₂ the current wire 2 (A)
r = the distance between two current carrying wires (m)
