AP (Advanced Placement) Physics(BC): Questions 682  685 of 921
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Question number: 682
» Magnetic Field & Electromagnetism
Question
A coil having an axial length of and a radius of is pivoted in magnetic field having a flux density of . The current flowing through coil is . If the torque acting on the coil is , then how many number of turns of coil is there?
Choices
Choice (5)  Response  

a.  360 

b.  250 

c.  300 

d.  180 

e.  All of the above 

Question number: 683
Question
How much amount of a radioactive isotope of atomic weight is necessary to provide a source of particles of millicuries strength? Consider halflife of this radioactive isotope is .
Choices
Choice (5)  Response  

a. 


b. 


c. 


d. 


e.  None of the above 

Question number: 684
Question
An ideal gas is filled in a sealed and rigid cylinder. If the temperature increases, then the density of the ideal gas:
Choices
Choice (5)  Response  

a.  remains same 

b.  decreases 

c.  becomes zero 

d.  increases 

e.  All of the above 

Question number: 685
Question
In circuit diagram, combination of three equivalent resistors is connected with battery. The total current flowing through circuit is . If the internal resistance of battery and wires is negligible, then what is resistance of each resistor?
Choices
Choice (5)  Response  

a. 


b. 


c. 


d. 


e.  None of the above 
