How to find direction of electric field in variable magnetic field?
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The magnetic force on a moving charge is one of the most fundamental known. The magnetic force is as important as the electrostatic or Coulomb force. Yet the magnetic force is more complex, in both the number of factors that affects it and in its direction, than the relatively simple Coulomb force. The magnitude of the magnetic force FF on a charge qq moving at a speed vv in a magnetic field of strength BBis given by:
F=qvBsin(θ)F=qvBsin(θ)
where θ is the angle between the directions of vv and BB. This formula is used to define the magnetic strength BB in terms of the force on a charged particle moving in a magnetic field. The SI unit for magnitude of the magnetic field strength is called the tesla (T) in honor of the brilliant and eccentric inventor Nikola Tesla (1856–1943), who made great contributions to our understanding of magnetic fields and their practical applications. To determine how the tesla relates to other SI units, we solve F=qvBsin(θ)F=qvBsin(θ) for BB:
B=Fqvsin(θ)B=Fqvsin(θ)
Because sinθ is unitless, the tesla is
1T=1NC∗m/s=1NA∗m
F=qvBsin(θ)F=qvBsin(θ)
where θ is the angle between the directions of vv and BB. This formula is used to define the magnetic strength BB in terms of the force on a charged particle moving in a magnetic field. The SI unit for magnitude of the magnetic field strength is called the tesla (T) in honor of the brilliant and eccentric inventor Nikola Tesla (1856–1943), who made great contributions to our understanding of magnetic fields and their practical applications. To determine how the tesla relates to other SI units, we solve F=qvBsin(θ)F=qvBsin(θ) for BB:
B=Fqvsin(θ)B=Fqvsin(θ)
Because sinθ is unitless, the tesla is
1T=1NC∗m/s=1NA∗m
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Answer:
The right-hand rule for a wire is point your thumb in the direction of the current, wrap your fingers around the wire, and they will point in the direction of the magnetic field.
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