Phys 1114: Assignment 9 Abbott (5420633) Due: Mon Apr 7 2014 11:59 PM CDT Question 1 2 3 4 5 6 7 8 9 10 11 1. Question Details C14: Magnetic Field Direction Abbott [2861537] a) A wire is oriented horizontally along the direction and a compass is placed directly above it with the needle facing. When a current in the wire flows will the needle of the compass deflect and if so, in what direction? Yes, the needle will deflect directly toward the. No, the needle will not deflect. Yes, the needle will deflect toward the. Yes, the needle will deflect directly toward the. b) A wire is oriented horizontally along the direction and a compass is placed directly above it with the needle facing. When a current in the wire flows will the needle of the compass deflect and if so, in what direction? Yes, the needle will deflect toward the. Yes, the needle will deflect directly toward the. Yes, the needle will deflect directly toward the. No, the needle will not deflect. 2. Question Details C14: Field direction from circular loop Abbott [2861538] a) A circular loop of wire is placed so its plane is parallel to the earth's surface horizonatlly. When viewed from above, the wire has a current moving in the counterclockwise direction. What is the direction of the magnetic field at the center of the circular loop of wire? no magnetic field clockwise counterclockwise b) If you think of this circular loop of wire as a little bar magnet, which direction is the pole of the magnet facing?
3. Question Details C14: Magnetic force direction on particle Abbott [2861540] a) A uniform magnetic field is directed horizontally toward the, and a positive charge is moving through this field. Is there a magnetic force on this charge, and if so, in what direction? Yes, the magnetic force on the charge is directed ward. Yes, the magnetic force on the charge is directed ward. Yes, the magnetic force on the charge is directed ward. Yes, the magnetic force on the charge is directed ward. b) A uniform magnetic field is directed horizontally toward the, and a negative charge is moving through this field. Is there a magnetic force on this charge, and if so, in what direction? Yes, the magnetic force on the charge is directed ward. Yes, the magnetic force on the charge is directed ward. Yes, the magnetic force on the charge is directed ward. Yes, the magnetic force on the charge is directed ward. c) A uniform magnetic field is directed horizontally toward the, and a postive charge is moving through this field. Is there a magnetic force on this charge, and if so, in what direction? Yes, the magnetic force on the charge is directed ward. Yes, the magnetic force on the charge is directed ward. Yes, the magnetic force on the charge is directed ward. Yes, the magnetic force on the charge is directed ward. d) A uniform magnetic field is directed horizontally toward the, and a negative charge is sitting in the field but not moving. Is there a magnetic force on this charge, and if so, in what direction? Yes, the magnetic force on the charge is directed ward. Yes, the magnetic force on the charge is directed ward. Yes, the magnetic force on the charge is directed ward. Yes, the magnetic force on the charge is directed ward. e) A particle moving directly ward is deflected to the by a magnetic field pointing. What is the charge on the particle? There is not enough information given to decide. neutral positive negative
4. Question Details C14: Magnetic force direction on a wire Abbott [2861541] a) A wire is placed vertically with current flowing ward in a uniform magnetic field that faces. Which direction will the wire feel a force? b) A wire is placed horizontally along the direction in a uniform magnetic field. When current flows in the direction it is found that the wire can levitate. Which direction could the magnetic field point? 5. Question Details C14: Two wires force direction Abbott [2861542] Two long straight wires are placed next to each other horizontally along the direction. a) If the current in the two wires flows in the same direction, what is the direction of the force on the wire to the. b) If the current in the two wires flows in the opposite direction, what is the direction of the force on the wire to the.
6. Question Details C14: Force on charged particle Abbott [2861543] A particle moving with a speed of 5200 m/s in a uniform magnetic field pointing ward with a strength of 0.32 T feels a force of 340 N toward the. a) What is the magnitude of the charge on the particle? 0.204 C b) Does the particle have a positive or negative charge? negative positive c) If you were to continue to watch the motion of this particle from above it looking on the particle, what would its motion do? move in a clockwise circle with increasing speed move in a counterclockwise circle with increasing speed move in a clockwise circle with constant speed none of the above move in a counterclockwise circle with constant speed 7. Question Details C14: Magnetic force on a wire Abbott [2861544] A straight 12 cm wire carries a current of 8.4 A. The direction of the current is perpendicular to a uniform magnetic field with a magnitude of 4.4 T. What is the magnitude of the magnetic force on wire? 4.44 N 8. Question Details C14: Force/Length on two wires Abbott [2861545] Two long parallel wires are placed a distance of 11 cm from each other. One wire carryies a current of 3.9 A and the other carries a current of 8.8 A, a) What is the magnetic force per unit length exerted on the wire carrying 3.9 A? 6.24e05 N/m b) What is the magnetic force per unit length exerted on the wire carrying 8.8 A? 6.24e05 N/m c) If the distance between the two wires is tripled by what factor does the force per unit length change? 0.333
9. Question Details C14: Flux and Faraday's Law Abbott [2861546] A coil of wire with 150 turns is wrapped in a circular shape with a radius of 26 cm. The plane of the coil is perpendicular to a magnetic field of magnitude 4.0 T. (a) What is the cross sectional area of the coil in m 2? 0.212 m 2 (b) What is the magnetic flux through the coil? 127 T m 2 (c) In a time of 0.40 s the coil is rotated 90 so that the plane of the coil is parallel to the magnetic field? What is the magnetic flux through the coil after the rotation? 0 T m 2 (d) What is the average value of the induced voltage during the time the coil is rotated? 319 V 10. Question Details C14: Faraday's Law Abbott [2861547] A 50 turn coil of wire has an area of 0.53 m 2. A uniform magnetic field of 0.60 T points in a direction that is perpendicular to the plane of the wire. In a time of 0.68 s the field reverses direction and points the other way with a magnitude of 0.30 T. What is the average value of the induced voltage during the time the magnetic field reversed direction? 35.1 V 11. Question Details C14: Transformer Abbott [2861548] A transformer has 20 turns of wire in its primary coil and 65 turns on its secondary coil. (a) Is this a step or step transformer? step step (b) If an alternating voltage with an effective voltage of 140 V is applied to the primary, what is the effective voltage induced in the secondary? 455 V (c) If 3.7 A of current is splied to the primary coil, what is the current in the secondary coil? 1.14 A (d) What is the power delivered to this transformer? 518 W Assignment Details