An electron moving in the positive y direction, at right angles to a magnetic field, experiences a magnetic force in the negative x direction. What is the direction of the magnetic field?
A) It is in the negative x direction.
B) It is in the positive x direction.
C) It is in the positive y direction.
D) It is in the negative z direction.
E) It is in the positive z direction.
E
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A) a molten metallic core only B) fast rotation only C) a rocky mantle only D) both a molten metallic core and reasonably fast rotation E) both a metal core and a rocky mantle
Meters: A galvanometer with a coil resistance of 40.0 ? deflects full scale for a current of 2.0 mA. What series resistance should be used with this galvanometer in order to construct a voltmeter that deflects full scale for 50 V?
A. 25 k? B. 27 k? C. 29 k? D. 31 k?
How do we measure stellar masses?
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a. 2.0 c. 1.0 b. 1.4 d. 0.71