A device called a railgun uses the magnetic force on currents to launch projectiles at very high speeds. An idealized model of a railgun is illustrated in (Figure 1). A 1.2 V power supply is connected to two conducting rails. A segment of copper wire, in a region of uniform magnetic field, slides freely on the rails. The wire has a 0.73 m2 resistance and a mass of 7.0 g. Ignore the resistance of the rails. At some moment, the power supply is switched on. For the steps and strategies involved in solving a similar problem, you may view a Video Tutor Solution. Figure 1.2 V X X 15 cm x X xax X 1 of 1 X Xx X X X X X X X X X X X X X X X B=0.80 T > What is the current? Express your answer with the appropriate units. Ti I= Value Submit μA ▾ Part D Part B Complete previous part(s) Part C Complete previous part(s) Request Answer vf= μÀ → Value Units What will be the wire's speed after it has slid a distance of 1.0 mm? Express your answer with the appropriate units. By ? Units Comme ?

A device called a railgun uses the magnetic force on currents to launch projectiles at very high speeds. An idealized model of a railgun is illustrated in (Figure 1). A 1.2 V power supply is connected to two conducting rails. A segment of copper wire, in a region of uniform magnetic field, slides freely on the rails. The wire has a 0.73 m2 resistance and a mass of 7.0 g. Ignore the resistance of the rails. At some moment, the power supply is switched on. For the steps and strategies involved in solving a similar problem, you may view a Video Tutor Solution. Figure 1.2 V X X 15 cm x X xax X 1 of 1 X Xx X X X X X X X X X X X X X X X B=0.80 T > What is the current? Express your answer with the appropriate units. Ti I= Value Submit μA ▾ Part D Part B Complete previous part(s) Part C Complete previous part(s) Request Answer vf= μÀ → Value Units What will be the wire's speed after it has slid a distance of 1.0 mm? Express your answer with the appropriate units. By ? Units Comme ?

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter11: Magnetic Forces And Fields

Section: Chapter Questions

Problem 28P: An electron in a TV CRT moves with a speed of 6.0107 m/s, in a direction perpendicular to Earth's...

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(a) A 200-turn circular loop of radius SO.0 cm is vertical, with its axis on an east-west line. A current of 100 A circulates clockwise in the loop when viewed from the east. Earth’s field here is due north, parallel to the ground, with a strength of 3.0105T. What are the direction and magnitude of the torque on the loop? (b) Does this device have any practical applications as a motor?
An electron in a TV CRT moves with a speed of 6.0107 m/s, in a direction perpendicular to Earth's field, which has a strength of 5.0105 T. (a) What strength electric field must be applied perpendicular to the Earth’s field to make the election moves in a straight line? (b) If this is done between plates separated by 1.00 cm, what is the voltage applied? (Note that TVs are usually surrounded by a ferromagnetic material to shield against external magnetic fields and avoid the need for such a collection,)
The square armature coil of an alternating current generator has 200 turns and is 20.0 cm on side. When it rotates at 3600 rpm, its peak output voltage is 120 V. (a) Wliat is the frequency' of the output voltage? (b) What is the strength of the magnetic field in which the coil is turning?
(a) What is the speed of a supersonic aircraft with a 17.0-m wingspan, if it experiences a 1.60V Hall voltage between its wing lips when in level flight over the north magnetic pole, where the Earth's field strength is 8.00105T ? (b) Explain why very little current flows as a result of this Hall voltage.
A particle moving downward at a speed of 6.0106 m/s enters a uniform magnetic field that is horizontal and directed from east to west. (a) If the particle is deflected initially to the north in a circular arc, is its charge positive or negative? (b) If B = 0.25 T and the charge-to-mass ratio (q/m) of the particle is 40107 C/kg. what is ±e radius at the path? (c) What is the speed of the particle after c has moved in the field for 1.0105s ? for 2.0s?
Frustrated by the small Hall voltage obtained in blood flow measurements, a medical physicist decides to increase the applied magnetic field strength to get a 0.500-V output for blood moving at 30.0 cm/s in a 1.50-cm-diameter vessel. (a) What magnetic field strength is needed? (b) What is unreasonable about this result? (c) Which premise is responsible?
a) What is the speed of a supersonic aircraft with a 17.0 -m wingspan, if it experiences a 1.60 -V Hall voltage between its wing tips when in level flight over the north magnetic pole, where the Earth's field strength is 8.00×10−5T? (b) Explain why very little current flows as a result of this Hall voltage.
A conducting rod of length l moves on two horizontal, frictionless rails as shown. If a constant force of 1.00 N moves the bar at 2.00 m/s through a magnetic field ? ⃗ ⃗ that is directed into the page, (a) What is the current through the 8.00 Ω resistor, R? (b) What is the rate at which energy is delivered to the resistor? (c) What is the mechanical power delivered by the force ? app?
(a) Find the direction of the force on a proton moving through the magnetic fields in Figure P19.2, as shown. (b) Repeat part (a), assuming the moving particle is an electron.
An electron passes through a point 3.47 cm from a long straight wire as it moves at 39.3% of the speed of light perpendicularly toward the wire. At that moment a switch is flipped, causing a current of 18.3 A to flow in the wire. Find the magnitude of the electron's acceleration ?a at that moment. ?=
A cyclotron designed to accelerate protons has a magnetic field of magnitude 0.360 T over a region of radius 2.40 m. (a) What is the cyclotron frequency? (b) What is the maximum speed acquired by the protons?
A small airplane with a wingspan of 14.0 m is flying due north at a speed of 70.0 m/s over a region where the vertical component of the Earth’s magnetic field is 1.20 μT downward. (a) What potential difference is developed between the airplane’s wingtips? (b) Which wingtip is at higher potential? (c) What If? How would the answers to parts (a) and (b) change if the plane turned to fly due east? (d) Can this emf be used to power a lightbulb in the passenger compartment? Explain your answer.