A long straight wire on the z-axis carries a current of 6.0 A in the positive direction. A circular loop in the xy-plane, of radius 10 cm, carries a 1.0-A current, as shown in the figure. Point P, at the center of the loop, is 25 cm from the z-axis. An electron is projected from P with a velocity of 1.0 × 106 m/s in the negative x-direction. What is the y component of the force on the electron?
A) zero
B) -1.0 x 10^-18 N
C) +2.0 x 10^-18 N
D) -2.0 x 10^-18 N
E) +1.0 x 10^-18 N
Answer: B) -1.0 x 10^-18 N
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A 600-kg car is going around a banked curve with a radius of 110 m at a speed of 27.5 m/s. What is the appropriate banking angle so that the car stays on its path without the assistance of friction?
A) 35.0° B) 13.5° C) 33.8° D) 56.2° E) 60.9°
The flatness problem is the fact that the observed density of matter is unexpectedly different from the critical density predicted by the inflationary epoch
Indicate whether the statement is true or false
Rubber rods charged by rubbing with cat fur repel each other. Glass rods charged by rubbing with silk repel each other. A rubber rod and a glass rod charged respectively as above attract each other. A possible explanation is that
A. any two rubber rods charged this way have opposite charges on them. B. any two glass rods charged this way have opposite charges on them. C. a rubber rod and a glass rod charged this way have opposite charges on them. D. all rubber rods always have an excess of positive charge on them. E. all glass rods always have an excess of negative charge on them.
One way to expand yields of crops is to increase the area under cultivation. This has few impacts other than an expansion of crop supply
What will be an ideal response?