A spatially uniform magnetic field cannot exert a magnetic force on a particle in which of the following circumstances? There may be more than one correct statement
1.The particle is charged.
2.The particle moves perpendicular to the magnetic field.
3.The particle moves parallel to the magnetic field.
4.The magnitude of the magnetic field changes with time.
5.The particle is at rest.
3,5
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Induction: If two objects are electrically attracted to each other,
A. both objects must be negatively charged. B. both objects must be positively charged. C. one object must be negatively charged and the other object must be positively charged. D. the objects could be electrically neutral. E. None of these statements are absolutely true.
The low density universe is an open one, with expansion continuing forever
Indicate whether the statement is true or false
A simple electrical circuit has a constant voltage power supply and a variable resistor. As you increase the resistance the current flow _____________
a. increases b. decreases c. remains the same d. cannot be determined
The gravitational field at the earth due to the moon is (the mass of the moon is 
kg and separated by a distance of 
A. 
B. 
C. 
D. 
E. 