Physics Magnetism,Magnetic Effects Of Current Level: University
Charge Moving in Magnetic FieldIn a certain reion the average radius of curvature of the trajectory of electrons in the Van Allen belt is 300m and the average electron energy is 100keV. What is the value of the earths magnetic field in this region?
Physics Magnetism,Magnetic Effects Of Current Level: University
2 identical wires have a weight per unit length of 1.0 x 10^-4 N/m. The wire are strug parallel to each other one directly above the other with a distance of separation of 0.10m. What current must be present in the 2 wires in order for the upper wire to float above the lower wire. Assume that the wires carry the same current in opposite directions.
Physics Magnetism,Magnetic Effects Of Current Level: University
A long straight wire carries a current of 5.00 A. At one instant a proton 4.00 mm from the wire travels at 1.50 x 10^3 m/s parallel to the wire and in the same direction as the current. Find the magnitude and direction of the magnetic force on the proton.
Physics Magnetism,Magnetic Effects Of Current Level: University
A porton moves in a circular orbit of radius 14 cm in a uniform magnetic field of 0.35 T directed perpendicular to the velocity of the proton. Find the orbit ( linear) speed of the proton.
Physics Magnetism,Magnetic Effects Of Current Level: University
A porton with a speed of 1.0 x 10^5m/s through the earths magnetic field which has a value of 55uT at a particular loction. When the proton moves east the magnetic force acting on it is maximum. When it moves northward it experiences no magnetic force. Find the magnitude and direction of the maximum magnetic force.
Physics Magnetism,Magnetic Effects Of Current Level: University
Earth MagnetismTwo current carrying wires lie in a horizontal plane as shown to the right ( you are looking down on them from above). The current in wire 1 is 3.75 A the current in wire 2 is adjusted to make the net magnetic field (5.50 x 10^-5 T). The combined fields point opposite to the earth's magnetic field which points vertically down. Find the magnitude and direction of the current in wire 2. Also find the net field ( magnitude and direction ) at the midpoint between the wires.
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Physics Magnetism,Magnetic Effects Of Current Level: University
A rectangular current loop carrent of 8.0 A inthe direction.
Shown: A very long wire is parallel to the sides of the rectangle and carries a current I. The rectangle loop has a length of 0.80 m and its sides are 0.10 and 0.70 m from the long wire. What must be the value of the current I in the long wire to produce an attractive net force of 2.3 x 10^6 N on the rectangle? Show on the diagram below the direction of the current in in the long wire.
Question Diagram
Physics Magnetism,Magnetic Effects Of Current Level: University
Current(a) How could the direction of a magnetic field be determined by making qualitative observations of the magnetic force on a straight wire carrying current. Explain with an example
(b) Intelligent Signals
A car stops for a red light at an intersection. As it comes to a halt it moves over a coil embedded in the surface of the road. As a result the light soon changes from red to green. Explain how the coil is able to signal the light change.
(c) Automatic ON/OFF switches
A current was sent through a helical coil spring. The spring contracts as through it had been compressed and so the circuit continuity is lost. Since there is no current the helical coil stretches back and again makes contact again getting current back to the system.So the same process repeats itself working like an automatic ON/OFF (toggle) switch. Why do the spring compress when current start flowing through the circuit. Explain.
Physics Magnetism,Magnetic Effects Of Current Level: University
Ampare circuital LawA conductor is made in the form of a hollow cylinder with an inner and outer radii of a and b respectively. It carries a curent I uniformly distributed over its entire cross-section. Derive expressions for the magnitude of the magnetic fielding the regions and then graph it (i) r < a (ii) a < r < d (iii) r > c
Physics Magnetism,Magnetic Effects Of Current Level: University
Magnetic effect of currentA wire carries a current of 22 A from east to west. Assume that at this location the Earth s magnetic field is horizontal and directerd from south to north. The magnitude of the field at this location is 500 u T. Find the magnitude and direction of the magnetic force on a 36-m lenght of wire in this field. How does the force change if the current runs from west to east?
Physics Magnetism,Magnetic Effects Of Current Level: University
Lorentz forceAn electron travels through qa region of space with no acceleration. Which one of the following statements is the best conclusion?
(a) Both E and B must be zero in that region
(b) E must be zero, but B might be non- zero in that region
(c) B must B might both be non-zero but they must be mutually perpendicular
(d) B must be zero but E might be non-zero in that region
(e) E and B might both be non- Zero but they must point in opposite directions.
Physics Magnetism,Magnetic Effects Of Current Level: University
Torque on current coilA circular coil consists of 5 loops each of diameter 1.0m. The coil is placed in an external magnetic field of 0.5T. When the coil carries a current of 4.0A a torque of magnitude 3.93N * m acts on it. Determine the angle between the normal to the plane of the coil and the direction of the magnetic field.
(a) 0
(b) 30
(c) 45
(d) 60
(e) 90
Physics Magnetism,Magnetic Effects Of Current Level: High School
Force on a current carrying conductor in a magnetic field
A rail gun is a device that propels a projectile using a magnetic force . A simplified diagram of this device is shown above. The projectile in the picture is a bar of mass M and length D , which has a constant current I flowing through it in the +y direction as shown . The space between the thin frictionless rails contains a uniform magnetic field B , perpendicular to the plane of the page . The magnetic field and rails extend for a distance L . The magnetic field exerts a constant force F on the projectile as shown . Express all graphic answers to the following parts in terms of the magnitude F of the constant magnetic force , other quantities given above , and fundamental constants .
a) Determine the position x of the projectile as a function of time I while it is on the rail if the projectile starts from rest at x = 0 when t = 0 ,
b) Determine the speed of the projectile as it leaves the right-hand end of the track .
d) In what direction must the magnetic field B point in order to create the force F ? Explain your reasoning .
e) Calculate the speed of the bar when it reaches the end of the rail given the following value ?
B = 5 T , L = 10 m , I = 200 A , M = 0.5 kg , D = 10 cm
Physics Magnetism,Magnetic Effects Of Current Level: High School
Force on a charged particle in a magnetic field
A proton is passed through a velocity selector made up of a two charged plates that create a uniform vertical electric field E , and a uniform magnetic field B that points into the page (see diagram) . If the magnitude of B is 2 m T , what should the magnitude of the electric field be if we wish for particles with a speed of 2 x 10^6 m/s to pass undeflected through the apparatus ? which of the plates must be positively charged ?
Question Diagram
Physics Magnetism,Magnetic Effects Of Current Level: High School
The two wires of a 2.5 m long appliance cord are 3.5 mm apart and carry a current of 7.0 A dc . Calculate the force one wire exerts on the other .