Multiple-Choice Homework Problem 18.7 The figure to the right shows a loop that
ID: 1449179 • Letter: M
Question
Multiple-Choice Homework Problem 18.7 The figure to the right shows a loop that carries a current I in the clockwise di- rection. What is the direction of the magnetic moment of the loop? Select One of the Following (a) into the page (b) out of the page (c) to the left of the page (d) to the right of the page (e) clockwise Multiple-Choice Homework Problem 18.8 A rail gun is constructed of two parallel rails of length 1.75m and distance 3cm apart (center-to-center). Use the field of an infinite straight wire to approximate the field of the rails. If 100, 000A flows in the rail gun, compute the force one rail exerts on the other Select One of the Following (a) 8.5N (b) 58, 000N (c) 120,000N (d) 175N (e) 1.4 × 107x Multiple-Choice Homework Problem 18.9 The figure to the right shows two infinite parallel wires carrying current into and out of the page. They carry currents of equal magnitude in the directions drawn. What is the direction of the force experienced by each wire? Wire 1 Wire 2 Select One of the Following (a) Wire 1 experiences a force to the left of the page and Wire 2 a force to the left of the page. (b) Wire 1 experiences a force to the left of the page and Wire 2 a force to the right of the page. (c) Wire1 experiences a force to the right of the page and Wire 2 a force to the left of the page. (d) Wire 1 experiences a force to the right of the page and Wire 2 a force to the right of the page. (e) The force felt by each wire is zero.Explanation / Answer
1)
The direction of the magnetic dipole moment is perpendicular to the plane of the loop, given by Right hand rule.
So Correct option - Into the page.
2)
F = I2*L*B
Where B = (uo*I1)/(2**r)
F = (uo*I1*I2 *L)/(2**r)
F = (2*10^-7 * (10^5)^2 * 1.75)/(0.03)
F = 1.2 * 10^5 N
Correct option - (c)
3)
Using Right hand rule,
Wire 2 experiences force, to the Right.
Wire 1 Experiences force, to the Left.
Correct Option - (b)
4)
Magnetic Field will be perpendicular to the direction of Electric Field
(b) Out of the Page.
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