1)A long wire carries 100 A of current that is perpandicularto the magnetic fiel
ID: 1677724 • Letter: 1
Question
1)A long wire carries 100 A of current that is perpandicularto the magnetic field lines of a uniform magnetic field of 5mT. At what distance from the wire is the net fieldzero? 2)Two long straight wires 20 cm apart carry equal valuecurrent I but in opposite direction. Do they attract or repeleach other? What is the current I if the force per unitlength between them is 5x10-9 N/m? 1)A long wire carries 100 A of current that is perpandicularto the magnetic field lines of a uniform magnetic field of 5mT. At what distance from the wire is the net fieldzero? 2)Two long straight wires 20 cm apart carry equal valuecurrent I but in opposite direction. Do they attract or repeleach other? What is the current I if the force per unitlength between them is 5x10-9 N/m?Explanation / Answer
2) given that distance between the wires = d = 20cm = 0.2m force per unit length = F/L = 5x10-9 N/m now force per unit length exerted on eachwire F/L = 0 I2/2d I = F/L * 2d/0 = 5x10-9 N/m *2*3.14 * 0.2m/4*3.14 *10-7 = 5 * 10-2 * 0.1 = -----A they repel each other 1) I = 100A B = 5 * 10-3 T B = 0 I/2r r = o I/2B where = 0 = 4 *10-7T.m/A plug in value r = -------m
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