A toroid is made of 2 000 turns of wire of radius 2.00 cm formed into a donut shape of inner radius 10.0 cm and outer radius 14.0 cm. When a 30.0-A current is present in the toroid, the magnetic field at a distance of 11.0 cm from the center of the toroid is
a. 0.0857 T.
b. 0.109 T.
c. 0.120 T.
d. 0.600 T.
e. 0.685 T.
b
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The impact of a 100-meter object will not cause "widespread" devastation, but it could still kill millions of people if it struck a major city. In Part C, you found that the probability of such an impact in any single year is only 1 in 1000. Suppose we learn that it has already been 1200 years since the last such impact. What would that tell us?
A. Nothing; we would still presume that the chance of such an impact during the next year is 1 in 1000. B. We are clearly due for such an impact, so the actual probability for the coming year must be much higher than 1 in 1000. C. We are overdue for the impact of a 100-meter object, so we should expect the impact of an even larger object during the next few years. D. There must be something wrong with the graph, because if the 1 in 1000 probability were correct, then there would have been an impact some time during the past 1000 years. Since there wasn't, the actual probability must be lower than 1 in 1000.
As a spaceship's velocity gets closer to the speed of light with respect to an external observer, that observer will report that
A) its length will increase and its clock will run more slowly. B) its length will decrease and its clock will run faster. C) its length will decrease and its clock will run more slowly. D) its length will increase and its clock will run faster. E) None of these will happen.
A heavy rock and a light rock are dropped from the same height and experience no significant air resistance as they fall. Which of the following statements about these rocks are correct? (There could be more than one correct choice.)
A) Both rocks have the same kinetic energy when they reach the ground. B) Both rocks have the same speed when they reach the ground. C) The heavier rock reaches the ground before the lighter rock. D) Just as they were released, both rocks had the same amount of gravitational potential energy. E) When they reach the ground, the heavier rock has more kinetic energy than the lighter rock.
What is the percent error of your newly calibrated thermometer in your determination of the existing air temperature in the laboratory? Use the reading on the standard commercially calibrated thermometer as the accepted value. Show your work. Percent error = ____________
Fill in the blank(s) with correct word