The centers of two circular loops are separated by a fixed distance. For what relative orientation is their mutual inductance a minimum?
1.coaxial and lying in parallel planes
2.lying in the same plane
3.lying in perpendicular planes, with the center of one on the axis of the other
4.The orientation makes no difference.
3
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Multiple-Object Accelerating Systems: Three boxes rest side-by-side on a smooth, horizontal floor. Their masses are 5.0 kg, 3.0 kg, and 2.0 kg, with the 3.0-kg mass in the center. A force of 50 N pushes on the 5.0-kg box, which pushes against the other two boxes. What magnitude force does the 5.0-kg box exert on the 3.0-kg box?
A. 0 N B. 10 N C. 25 N D. 40 N E. 50 N
An ideal transformer has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary,
(a) what voltage is present in the secondary? (b) what current is present in the secondary?
What is the equivalent resistance between points a and b when R = 30 ??
a.
27 ?
b.
21 ?
c.
24 ?
d.
18 ?
e.
7.5 ?