Two coils are placed near each other as shown in Figure OQ31.9. The coil on the left is connected to a battery and a switch, and the coil on the right is connected to a resistor. What is the direction of the current in the resistor at an instant immediately after the switch is thrown closed?
2
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Two long parallel wires 79.4 cm apart are carrying currents of 12.6 A and 28.1 A in the opposite direction. What is the magnitude of the magnetic field halfway between the wires?
a. 7.81E–6 T b. 6.35E–6 T c. 2.05E–5 T d. 1.42E–5 T e. 1.03E–5 T
What current must be maintained in a square loop (50 cm on a side) to create a torque of 1.0 N / m about an axis through its center and parallel to one of its sides when a magnetic field of magnitude 70 mT is directed at 40° to the plane of the loop?
a. 66 A b. 89 A c. 61 A d. 75 A e. 37 A
If a force on an object is aimed perpendicular to the direction of the object's velocity, the force does
a. no work c. negative work b. positive work d. any of the above
According to special relativity
1) space and time are aspects of each other. 2) mass and energy are aspects of each other, 3) both of the above, 4) neither of the above, and the underlying postulate of special relativity is 5) F = ma. 6) E = mc2. 7) that the speed of light has a constant value for all observers.