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Unformatted text preview: Two questions: (1) How to find the force, F on the electric charge, q excreted by the field E and/or B? (2) How fields E and/or B can be created? B v q E q F + = 2 r Q k E = Gausss law for electric field Electric charges create electric field: For one not moving (v<<c) charge: Gausss law for magnetic field Magnetic charges do not exist: Amperes law Electric current creates magnetic field: (As we will see later, this law should be extended ) Maxwells equations cos encl E Q A d E dA E = cos = A d B dA B B encl I l d B dl B cos = ; dt d B - = Faradays law A changing magnetic field induces an EMF A changing magnetic flux induces an electric field ! - = A d B dt d l d E 11. Electromagnetic induction (Faradays law) 1) Flux (review) A d B A d B d B B 2) EMF (review) l d E q l d F q dW 3) Faradays law dt d B - = - = A d B dt d A changing magnetic flux induces an electric field! This electric field is not a potential field. The field lines form a closed loops....
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