Exam 4

University Physics II

April L4, 2A06

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Show all your work on the problems (notations, diagrams, equations,

calculations, substitutions, final answer encircled in a box). Give short

explanation of what you are doing. Academic honesty is presumed.

Problem 1.

Problem 2.

Problem 3.

Problem 4.

Problem 5.

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18 points I tr

TOTAL: 90 points {, tl

FIRST LETTER OFYOUR LAST NAME

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Problem 1.

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A wire segment 3 mm long carries a current of 3 A in the r direction. It lies in amagnetic field of magnitude 0.02 T that is in the ry plane and makes an'angleof 30'with the r axis, as shown in Figure 28-9.Whal is the magnetic force ex-erted on the wire segment? ..

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Problem 2.

A long, straight wire carrying a cunent of 1.7 A in the positive z ciirection liesalong the line r = -3 cnq V = 0, Asimilar wire carrying a current of 1.7 Ain thepositive z direction lies along the line x = *3 cm, y = 0 as shown in Figure29-15. Find the magnetic field at a point P on the y axis at U = 6 cm.

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Find the magnetic flux through a solenoid ihat is 40 cm long, has a radius of2.5 cm, has 600- !gns, and'carries a cqrrent of 7.5 A.

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Problem 3.

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A uniform magnetic field makes an angle of 30' with the axis of a circular coilProblem 4. of 300 turns and a radius of 4 cm. The field changes at a rate of 85 T/s. Find the

magnitude of the induced emf in the coil.

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Problem 5' A z- p.F capacitor is charged to 20 V and is then connecterd across a 5-p.Hinduc-tor. hl What is the frequency of oscillation? (b) What is the maximum value ofthe current?

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