magnetic field strength (b) telsa (t) = 1 n/a m gauss = 10 -4 t
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Magnetic Field Strength (B)
Telsa (T) = 1 N/Am
Gauss = 10-4 T
Magnetic Force on a moving charge
FB = |q|vBSin
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B
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A charge of –q is shot into a region of E = 20,000 N/C and B = -.50T. What must be the velocity of the charge so that it is not deflected?
+q
B
v
Describe the motion of this charge
Magnetic Force on a current carrying wire
I I
FB = ILBsin
I B
L2
L1
Find the torque on this rectangular loop of wire
Magnetic Fields created by current carrying wires
I
B = 0I/(2r)
0 = permeability of free space (4 x 10-7 Tm/A)
I
e+
2 x 105 m/s
20 A
4 cm
Find the magnetic force on the proton
I1
I2
Find the magnetic force per unit length that each wire exerts on each other.
Motional EMF
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Conducting wires moving in a magnetic field
FB = qvBsin
= vBL
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Faraday’s Law of Electromagnetic Induction: The magnitude of the induced EMF is equal to the rate of change of magnetic flux through the circuit.
Magnetic Flux B = BAcos
= -dB/dt
B B
Lenz’s Law: When magnetic flux is changing, an induced current will occur to oppose the change in magnetic flux.
N N
B
A coil of wire of radius 8.4 cm is rotating in a magnetic field of 0.75 T. If it starts and an angle of 0 degrees and rotates to and angle of 45 degrees in 1.5 sec, find the magnitude of the induced voltage. What direction will the current flow in the wire?
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q
A charge of q is shot into a region of E = 15000 N/C and B = .85T. What must be the velocity of the charge so that it is not deflected?
I1
I2
Find the magnetic force per unit length that each wire exerts on each other.
V d = 7.5 cm
A conducting wire is moving with a velocity of 0.35 m/s in a magnetic field of 0.90 T. Find the magnitude of the induced EMF and the electric field. Determine the direction of the electric field
B
I
Determine the direction that this loop of wire will spin.
I = 12A
Determine the magnitude of the magnetic field generated by the wire below at a point 6.5 cm from the wire. Make a sketch to indicate the direction of the magnetic field.
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