UNIVERSITYEXP 8-PRELABCOLDAN COLLIN COLLEGE EXP 8 -PRELAB PHYSICS collin.edu/phy

Question

UNIVERSITYEXP 8-PRELABCOLDAN COLLIN COLLEGE EXP 8 -PRELAB PHYSICS collin.edu/physics PRE-LAB Instructions: Print out these pages. Feel free to refer to the lab instructions and other materials, your physics textbook, other students, etc. to help you to ponder, understand, and work out answers to the following question(s). Show your work& answers in the space(s) provided PRE-LAB Questions: 1) How can you make a compass without using iron or other ferromagnetie materials? 2) A 100 cm long solenoid has a total of 400 turns of wire and carries a current of 2.0 A. What is the magnetic field a) inside the solenoid? b) outside the solenoid? 3) Why does the presence of iron inside a solenoid greatly increase the magnetic field?

Explanation / Answer

1.) Use a small current-carrying coil or solenoid for the compass needle.

2.) a.) The magnetic field inside a solenoid is given by:

B = u0IN/l where u0 is the permeability constant = 4 x 10-7, I is current ,

and N is the number of turns, l length.

B = 4 x 10-7*2.0 *400/1

B = 0.001 T

b. Assuming the solenoid is ideal, the value of the magnetic field outside the solenoid is zero.

3.)The presence of iron core will increase the magnetic field produced by the solenoid due to high magnetic permeability of iron.

4.)According to the given questions,

B = [u0N/l] I ans the line equation is y = 3.7 x comparing both equations,

u0N/l = 3.7 where, u0 = 4 x 10-7, l = 0.1m substitute in the equation,

N = 3.7*0.1/4 x 10-7

N = 294436.6447

N = 294437 turns

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