Explan your aswers on multiple choice questions clearly and concisely in order t

Question

Explan your aswers on multiple choice questions clearly and concisely in order to get scores Conceptual Questions (5 points per question): 1. A magnetic field exerts a force on a charged particle Explain. A. Always B. never C. if the particle is moving across the field lines D. if the particle is moving along the field lines E. the particle is at rest In Ampere's law, $ A. Any suface B. Any enclosed surface C. Any path D. Any closed path 2. B-ds-41enetreted, the integration must be Over: Explain. Any closed path that surrounds all the current producing B Objective Questions (5 points per question): 3. A proton (charge te), traveling perpendicular to a magnetic field, experiences the same force as an alpha particle (charge +2e) which is also traveling perpendicular to the same field. The ratio of their speeds, A. 0.5 B. 1 C. 2 D. 4 E. 8 Explain Two long, parallel wires each carry the same current I in the same direction. Is the total magnetic field at the point P midway between the wires A. Directed into the page B. Directed out of the page C. zero D. directed to the left 4. Explain E. directed to the right Problems (15 points each) 5. A thin copper rod of 1.00 m long and a mass of 50.0 g is placed in a uniform magnetic field of 0.2 T which is in horizontal orientation pointing toward east, what should be the minimum current for the copper rod to levitate the copper rod above the ground? A single piece of wire is bent into a shape as shown right. A circular loop of radius R is connected to the straight wire with a separation distance of R current I flows in the direction as shown. What is the magnetic field generated by this wire at the center of the circular loop? 6. A

Explanation / Answer

1.In magnetic field,if charge is in motion,then only force will be experienced

F=qvBsin(theta)

So option(C) is correct

2

It must be over closed path

3

F=eVB

As charge of alpha is twice while force is same

So ration of speed is 2:1

4fl

Field will be zero at midpoint

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