1) A wire carrying 15 A makes a 23 angle with a uniform magnetic field. The magn

Question

1)

A wire carrying 15 A makes a 23 angle with a uniform magnetic field. The magnetic force per unit length of wire is 0.34 N/m .

Part A

What is the magnetic field strength? In (mT)

Express your answer using two significant figures.

Part B

What is the maximum force per unit length that could be achieved by reorienting the wire in this field? in (N/m)

Express your answer using two significant figures.

2)

Which of the following statements are true for magnetic field lines?

A. Magnetic field lines are close together in regions of space where the magnitude of the magnetic field is weak, and they are father apart in regions where it is strong.

B. At every point in space, the magnetic field vector at that point is tangent to the magnetic field line through that point.

C. Magnetic field lines form closed loops. They don't "begin" or "end" on charges.

D. Magnetic field lines can never intersect

E. Magnetic field lines point in the direction of the magnetic force acting on a charge.

Explanation / Answer

I am allowed to answer only 1 question at a time

1.

A)
F = B*I*L* sin thetha
F/L = B*I*sin thetha
0.34 = B*15* sin 23
B=0.058 T
=58 mT
Answer: 58 mT
B)
Maximum force per unit length will occur when thetha= 90 degree
In this case sin 90 =1
and
F/L = B*I
=0.058*15
=0.87 N/m
Answer: 0.87 N/m

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