lecture11 - 5. Magnetic forces on current B v q F = l A lA...

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Unformatted text preview: 5. Magnetic forces on current B v q F = l A lA N n nlA N d d v l v l = d v B l I F = I nqAv d = B l nqAv B v nlAq B v Nq F F d d d tot = = = = B l Id F d = Example: A straight wire carrying a current is placed in a region containing a magnetic field. The current flows in the +x direction. There are no magnetic forces acting on the wire. What is the direction of the magnetic field? sin IlB F = sin IdlB dF = B v d and between angle- 180 or , sin = = = = F Example: Example: A horizontal wire carries a current and is in a vertical magnetic field. A horizontal wire carries a current and is in a vertical magnetic field. What is the direction of the force on the wire? What is the direction of the force on the wire? B I 1) left 1) left 2) right 2) right 3) zero 3) zero 4) into the page 4) into the page 5) out of the page 5) out of the page B I Example: Example: A vertical wire carries a current and is in a vertical magnetic field....
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lecture11 - 5. Magnetic forces on current B v q F = l A lA...

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