An electron moves in the negative x direction, through a uniform magnetic field

Question

An electron moves in the negative x direction, through a uniform magnetic field that is in the negative y direction. The magnitude force on the electron is: a) is the negative x direction B) in the positive y direction C) in the negative y direction D) in the positive z direction E) in the negative z direction At a distance R from a current carrying wire, what is the direction of the magnetic field relative to the wire? A) in the negative a) radially toward the wire b) radially away from the wire c) in the direction that is perpendicular to both the wire and to the radial direction d) in the direction opposite to that of the current e) parallel to the wire Two parallel wires have currents that have the same direction, but differing magnitude. The current in wire A is i; and the current in wire B is 2i. Which one of the following statements concerning this situation is true? Answer ___ a) Wire A attracts wire B with half the force that wire B attracts wire A. b) Wire A attracts wire B with twice the force that wire B attracts wire A. c) Both wires attract each other with the same amount of force. d) Wire A repels wire B with half the force that wire B attracts wire A. e) Wire A repels wire B with twice the force that wire B attracts wire A. A coil of wire with N turns and area A is placed into a magnetic field of magnitude B. The angle of the normal to the plane of the cod is at an angle phi with respect to the magnetic field. According the Faraday's law, which of the following changes will produce an emf in a coil of wire? Answer ___ a) B remains the same b) A is decreased c) phi remains the same d) any of the above choices e) none of the above choices Which one of the following principle's or laws allows one to determine the direction of an induced current in a conducting loop of wire due to a changing magnetic flux? Answer ___ a) Faraday's law b) Gauss'law c) equivalence principle d) Lenz's law e) principle of induced magnetic flux

Explanation / Answer

6) f = q(v*b) = -e(-i*-j) = e(-k)

negative z direction

7) in the direction that is perpendicular to both the wire and to the radial direction

8) optin B

9) optiond

10) optiond lenz's law

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