concepts_ch5

# D into the page e out of the page i when the current

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Unformatted text preview: he page I B ConcepTest 5.6b Magnetic Force on a Wire II ConcepTest Magnetic A horizontal wire carries a current horizontal a) left and is in a vertical magnetic field. b) right What is the direction of the force on c) zero the wire? d) into the page e) out of the page I When the current is parallel to parallel the magnetic field lines, the force on the wire is zero. zero B ConcepTest 5.7a Magnetic Force on a Loop I Magnetic a) + x A rectangular current loop is rectangular b) + y b) in a uniform magnetic field. c) zero What is the direction of the d) - x d) net force on the loop? e) - y e) B z y x ConcepTest 5.7a Magnetic Force on a Loop I ConcepTest Magnetic A rectangular current loop is rectangular in a uniform magnetic field. What is the direction of the net force on the loop? a) + x b) + y b) c) zero d) - x d) e) - y e) Using the right-hand rule, we find that each of the four wire segments will experience a force outwards from the outwards center of the loop. Thus, the forces of the opposing segments cancel, so B z the net force is zero. zero y x ConcepTest 5.7b Magnetic Force on a Loop II ConcepTest Magnetic a) move up a) If there is a current in b) move down the loop in the direction c) rotate clockwise shown, the loop will: shown, d) rotate counterclockwise e) both rotate and move B field out of North B field into South N S N S ConcepTest 5.7b Magnetic Force on a Loop II Magnetic a) move up If there is a current in If b) move down the loop in the direction c) rotate clockwise shown, the loop will: shown, d) rotate counterclockwise e) both rotate and move Look at the North Pole: here the F magnetic field points to the right and right the current points out of the page. out N S The right-hand rule says that the force must point up. At the south pole, the up same logic leads to a downward force. downward Thus the loop rotates clockwise. clockwise F ConcepTest 5.8a Magnetic Field of a Wire I Magnetic a) direction 1 If the currents in these wires have b) direction 2 the sa...
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