concepts_ch5

# Field b down antiparallel to e b c into the page d out

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Unformatted text preview: ocity Selector Velocity a) up (parallel to E ) What direction would a B field What have to point for a beam of electrons moving to the right to electrons go undeflected through a region undeflected where there is a uniform electric field pointing vertically upward? field b) down (antiparallel to E ) b) c) into the page d) out of the page e) impossible to accomplish E B=? electrons v ConcepTest 5.5 Velocity Selector ConcepTest Velocity What direction would a B field What have to point for a beam of electrons moving to the right to electrons go undeflected through a region undeflected where there is a uniform electric field pointing vertically upward? field Without a B field, the electrons feel an electric force downwards. In order to downwards compensate, the magnetic force has to point upwards. Using the right-hand upwards rule and the fact that the electrons are negatively charged leads to a B field negatively pointing out of the page. out a) up (parallel to E ) b) down (antiparallel to E ) b) c) into the page d) out of the page e) impossible to accomplish E B=? electrons v ConcepTest 5.6a Magnetic Force on a Wire I Magnetic A horizontal wire carries a current horizontal and is in a vertical magnetic field. What is the direction of the force on the wire? a) left a) b) right c) zero d) into the page e) out of the page I B ConcepTest 5.6a Magnetic Force on a Wire I Magnetic A horizontal wire carries a current horizontal and is in a vertical magnetic field. What is the direction of the force on the wire? Using the right-hand rule, we see that the magnetic force must point out of the page. out Since F must be perpendicular to both I and B, you should realize that F cannot be in the plane of the page at all. plane a) left a) b) right c) zero d) into the page e) out of the page I B ConcepTest 5.6b Magnetic Force on a Wire II ConcepTest Magnetic a) left A horizontal wire carries a current horizontal b) right and is in a vertical magnetic field. c) zero What is the direction of the force d) into the page on the wire? e) out of t...
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