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Unformatted text preview: ORANGE couzxzrnv HOMEWORK SET 9 en ANGE COUNTRY
Phys 2114 Instructor: Professor Bandy Fall 2011 l. A real solenoid usually has a small but nonzero internal resistance. The solenoid considered for
our circuit speciﬁes an inductance of 53 mH and a resistance of 0.37 .(2. If the solenoid is
connected to a baﬁery, how long will the current take to reach half it ﬁnal equilibrium value? 2. Calculate the magnetic ﬁeld strength on Earth’s surface at either pole if the Earth’s magnetic
dipole moment is 4.0 x 1022 Amz. Give answer in Gauss units. @ If the circular conductor in Fig. 1 undergoes thermal expansion while it is in a uniform magnetic
ﬁeld, a current is induced clockwise around it. Is the magnetic ﬁeld directed into or out of the page? Explain. 4. The line integral of the magnetic ﬁeld on a closed path surrounding a wire has the value
17.6 ,uTm. Calculate the current in the wire. 5. We want to generate a 0.10 T uniform magnetic ﬁeld near the center of a IOcm—long
solenoid. Calculate the number of turns that are needed if the wire can carry a maximum
current of 10A. Figure 2 shows a cross section across a diameter of a long cylinder conductor of radius a = 2. 00
cm carrying uniform current 170 A. Calculate the magnitude of the current’s magnetic ﬁeld at
radial distance a. 0 cm, b. 1.00 cm, c. 2.00 cm (Wire’s surface), d. 4.00 cm. A solenoid of length 10 cm and radius 2 cm is wound uniformly with 1000 turns. A second coil
of 100 turns is wound around the solenoid at its center. Calculate the mutual inductance. Give answer in microHenry units. 8. An electric motor contains a 500turn circular coil 6.2 cm in diameter. If it is to develop a
maximum torque of 1.2 Nm at a current of 3. 3 A, calculate the magnetic ﬁeld strength 9 Calculate the rate of change of the solenoid’s magnetic ﬁeld when the induced electric ﬁeld 12
cm ﬁom the axis of the solenoid with a JO—cm radius is 90 V/m. Give answer in Tesla per
millisecond. In Fig. 3, four long straight wires are perpendicular to the page, and their cross sections form a square of edge length a = 13.5 cm. Each wire carries 7.50 A, and the currents are out of the page
in wires 1 and 4 and into the page in wires 2 and 3. In unitvector notation, calculate the net magnetic force per meter of wire length on wire 4. 11. Text problem 27 ~ 42 part a Only 2 @tuufiuugg FigureZ 4v 3
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This note was uploaded on 01/10/2012 for the course PHYS 2114 taught by Professor Bandy during the Spring '08 term at Oklahoma State.
 Spring '08
 Bandy

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