1) Two wires are carrying current I? = 4 A and I? = 6 A. These wires are parallel and d = 25 cm apart. Calculate the magnetic force between them: F = (2 X 10?)I?I?/d 2) Three wires are I? = 7 A, I? = 4 A, I? = 10 A. Wire 1 carries a current into the page at (0,0); wire 2 carries a current into the page at (25cm, 0); Wire 3 carries a current out of the page at (50 cm, 0). (a) Calc. the force between wires 1 and 2. This force is directed in the +i ( positive x) direction. (b) Calc. the force between wires 1 and 3. This force is directed in the - i (negative x) direction. (c) Add the force vectors in parts a and b to get the resultant force on wire 1. 3) A straight wire has current I = 6 A and the field point P is at a distance r = 75 cm from the wire. Calculate the magnetic field B at P in these units: (a) microTesla: B = 0.2 I/r (b) Tesla: B = 2 X 10? I/r 4) An arc of current subtends an angle of ? = ?/2 radians and has current I = 10 A. The radius of this arc is R = 35 cm. Calc. the magnetic field B = (??I?)/(4?R) where ?? = 4? X 10?
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25 m Permeability of free space μ0 = 2 x 10^-7 Tm/A Using the formula for magnetic field due to a current-carrying wire: B = (μ0 * I1) / (2πd) B Show more…
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