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# 8a magnetic field of a wire i conceptest magnetic if

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Unformatted text preview: me magnitude, but opposite c) direction 3 directions, what is the direction of d) direction 4 the magnetic field at point P? e) the B field is zero e) a P d b c ConcepTest 5.8a Magnetic Field of a Wire I ConcepTest Magnetic If the currents in these wires have the same magnitude, but opposite directions, what is the direction of the magnetic field at point P? a) direction 1 b) direction 2 c) direction 3 d) direction 4 e) the B field is zero e) a P Using the right-hand rule, we can sketch the B fields due to the two currents. Adding them up as vectors gives a them total magnetic field pointing downward. downward d b c ConcepTest 5.8b Magnetic Field of a Wire II ConcepTest Magnetic Each of the wires in the figures below carry the same current, either into or out of the page. In which case is the magnetic field at the center of the square greatest? a B=? b B=? a) arrangement 1 b) arrangement 2 c) arrangement 3 d) same for all c B=? ConcepTest 5.8b Magnetic Field of a Wire II ConcepTest Magnetic Each of the wires in the figures below carry the same current, either into or out of the page. In which case is the magnetic field at the center of the square greatest? a b a) arrangement 1 b) arrangement 2 c) arrangement 3 d) same for all c ConcepTest 5.9a Field and Force I Field a) + z (out of page) A positive charge moves parallel positive to a wire. If a current is suddenly turned on, which direction will the b) - z (into page) b) c) + x c) d) - x d) force act? force e) - y e) y +q x z I ConcepTest 5.9a Field and Force I ConcepTest Field A positive charge moves parallel positive to a wire. If a current is suddenly turned on, which direction will the force act? force a) + z (out of page) b) - z (into page) b) c) + x c) d) - x d) e) - y e) Using the right-hand rule to determine the magnetic field produced by the wire, we find that at the position of the charge + q (to the left of the wire) the B field points out of the page. Applying the right-hand out rule again for the magnetic force on the charge, we find that +q experiences a force in the +x direction. +x y +q x z I ConcepTest 5....
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