PHYSICS magnetic field

2012-01-14 5:12 pm

i am going to have exam very soon. can anyone please help me to solve the following problems. i have great difficulties in physics. thank you.

1. A triangular circuit is flat on the ground. A magnetic field of 0.8 mT is pointing to the east. A current of 2.5A circulates clockwise. Find the magnetic and direction of the magnetic force on the following segments of the circuit. Segment BC is 60cm long.
(a) segment AC
(b) segment AB
(c) segment BC

*The triangle is a right-angled triange. the angle is 40 degrees. opposite side is 60cm.

2. A horizontal wire experiences a 10N force directed straight up when it carries a 5A current toward the right. WHat will be the magnitude and direction of the force if the current is reversed and its magnitude doubled?

3. Right-hand rule. I am always confused with the application of right-hand rule. can you please show me some examples to explain it to me?

thanks a lot

回答 (1)

天同

2012-01-15 5:00 am

✔ 最佳答案

1. How is the orientation of the triangle? You need to give it out.

2. The direction of the force will become downward.
The magnitude of the force is doubled, i.e. 20 N

3. Are you referring to Fleming's Right Hand Rule?
Fleming's Right Hand Rule relates thedirections of the induced current, conductor motion and magnetic field. The three quantities are mutually perpendicular and are represented respectively by the middle finger, thumb and second finger.

You may refer to the diagram given below:

http://sciencecity.oupchina.com.hk/npaw/student/glossary/img/flemings_right_rule_2.jpg

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