Please answer all questions with explanation. Thank you! 2. Which of the followi

Question

Please answer all questions with explanation. Thank you!

2. Which of the following constitutes a magnetic dipole? (Check out page 480 in your text) a. A circular loop of current b. A square loop of current c. A refrigerator magnet d. Answer (a) and (b) e. All of the above 3. If we place a loop of wire in a magnetic field and run a current through it, the loop of wire will turn until the dipole moment is aligned with the magnetic field. This is an example of converting energy to energy. a. mechanical; electrical b. electrical; mechanical c. electrical; magnetic d. magnetic; electrical A rectangular loop of wire carries some current. It is placed in a uniform magnetic field such that and B external are parallel. The loop is free to move and/or rotate. when it is released, what do you expect the loop to do (i.e. rotate, move with the field, stay still, etc.)? Explain your reasoning 4.

Explanation / Answer

2) (d) answer a and b

3) (b) electrical; mechanical

The electrical energy (current) is converted to mechanical energy (rotation).

4) Stay still.

Torque is given by:

T = u x B (cross product)

= uBsin(th)

Parallel means th = 0 degree and sin0 = 0

So, T = 0 and hence it will stay still.

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