Physics Question?????? Need help pleaseeee!!!

Posted on 2014-11-20 05:35:00 in Physics by LARRY

1. An elastic conducting material is stretched into a circular loop of 13.1 cm radius. It is placed with its plane perpendicular to a uniform 1.18 T magnetic field. When released, the radius of the loop starts to shrink at an instantaneous rate of 58.5 cm/s. What emf is induced in volts in the loop at that instant?


2. In the figure, the magnetic flux through the loop increases according to the relation ?B = 6.7t2 + 7.8t, where ?B is in milliwebers and t is in seconds. 

(a) What is the magnitude of the emf induced in the loop when t = 1.9 s?

(b) Is the direction of the current through R to the right or left?

1. A small loop of area A = 8.4 mm2 is inside a long solenoid that has n = 838 turns/cm and carries a sinusoidally varying current i of amplitude 3.35 A and angular frequency 388 rad/s. The central axis of the loop and solenoid coincide. What is the amplitude of the emf induced in the loop?


2. In the figure, a metal rod is forced to move with constant velocity along two parallel metal rails, connected with a strip of metal at one end. A magnetic field of magnitude B = 0.391 T points out of the page. 


3.  If the rails are separated by 27.3 cm and the speed of the rod is 65.2 cm/s, what is the magnitude of the emf generated in volts? 


4.  If the rod has a resistance of 15.1 ? and the rails and connector have negligible resistance, what is the current in amperes in the rod? 


5.  At what rate is energy being transferred to thermal energy?

 

If 55.2 cm of copper wire (diameter = 0.750 mm, resistivity = 1.69 X 10-8ohm.m) is formed into a circular loop and placed perpendicular to a uniform magnetic field that is increasing at the constant rate of 11.6 mT/s, at what rate is thermal energy generated in the loop?

---

Answer Comment

No Answers Posted Yet.