A long solenoid (1000 turns/m) carries a current of 25 mA and has an inside radius of 2.0 cm. A long wire which is parallel to and 4.0 cm from the axis of the solenoid carries a current of 6.0 A. What is the magnitude of the magnetic field at a point on the axis of the solenoid?
a. 51 ?T
b. 61 ?T
c. 43 ?T
d. 81 ?T
e. 1.4 ?T
c
Physics & Space Science
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What is one of the drawbacks to using fuel cells?
A) The fuel of the fuel cells is hard to handle. B) They are less efficient than combustion energy sources or batteries. C) They are very big and bulky, which makes them hard to use in small devices. D) There are no drawbacks. E) only A and B
Physics & Space Science
The Doppler shift applies only to the line spectrum. It does not apply to the continuous (blackbody) spectrum.
Answer the following statement true (T) or false (F)
Physics & Space Science
What is the direction of 
at point Q?
A. A B. B C. C D. D E. E F. F T. Zero
Physics & Space Science
Consider the following circuits. Two identical batteries are connected to two identical inductors as shown. The switches are closed for a very long time