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# davis (dbd457) - HW-07 - mryasov - (41900) This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page...

I'm having trouble with number 3. While I know the answer is 4/3B, I do not know how to get to that answer.
I'm also having trouble with number 7. I got 1.8E-8 and my answer and it was marked incorrect.

davis (dbd457) – HW-07 – mryasov – (41900) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points An electron is accelerated by a 3 . 4 kV poten- tial di±erence. The charge on an electron is 1 . 60218 × 10 19 C and its mass is 9 . 10939 × 10 31 kg. How strong a magnetic feld must be expe- rienced by the electron iF its path is a circle oF radius 5 cm? Answer in units oF T 002 10.0 points A particle with a positive charge q and mass m is undergoing circular motion with speed v . At t = 0, the particle is moving along the negative x axis in the plane perpendicular to the magnetic feld V B , which points in the positive z direction as shown in the fgure below. x y z Vv V B ²ind the period oF the circular motion; i.e. , the time takes For the particle to complete one revolution. 1. T = q B m 2. T = 2 m q B 3. T = 2 π q B m 4. T = π q B m 5. T = 2 π mB q 6. T = mB q 7. T = m q B 8. T = 2 q B m 9. T = 2 mB q 10. T = 2 π m q B 003 10.0 points X Y a P 2 a Two long parallel wires are a distance 2 a apart, as shown above. Point P is in the plane oF the wires and a distance a From the wire X . When there is a current I in wire X and no current in wire Y , the magnitude oF the magnetic feld at P is B 0 . when there are equal currents I in the same direction in both wires, the magnitude oF the magnetic feld at P is 1. 10 9 B 0 2. 4 3 B 0 3. B 0 4. 2 B 0 5. 2 3 B 0 004 10.0 points A cross section oF a long solenoid that carries current I is shown.
davis (dbd457) – HW-07 – mryasov – (41900) 2 I I (into the page) I (out of the page) r All of the following statements about the magnetic Feld v B inside the solenoid are cor- rect EXCEPT 1. The magnitude of b v B b is proportional to the distance from the axis of the solenoid. 2. The magnitude of b v B b is proportional to the current I . 3. An approximate value for the magnitude of b v B b may be determined by using Amp` ere’s law. 4. b v B b is directed to the left. 5. The magnitude of b v B b is proportional to the number of turns of wire per unit length. 005 (part 1 of 3) 10.0 points ±ind the ²ux of the Earth’s magnetic Feld, of magnitude 6 . 39 × 10 5 T, through a square loop of area 12 . 3 cm 2 , when the Feld is per- pendicular to the plane of the loop. Answer in units of T m 2 006 (part 2 of 3) 10.0 points ±ind the ²ux of the Earth’s magnetic Feld through the square loop when the Feld makes a 28 . 3 angle with the normal to the plane of the loop. Answer in units of T m 2 007 (part 3 of 3) 10.0 points ±ind the ²ux of the Earth’s magnetic Feld through the square loop when the Feld makes a 77 angle with the normal to the plane. Answer in units of T m 2 008 10.0 points A solenoid 7 . 5 cm in radius and 68 m in length has 5000 uniformly spaced turns and carries a current of 9 . 2 A. Consider a plane circular surface of radius 2 . 1 cm located at the center of the solenoid with its axis coincident with the axis of the solenoid. What is the magnetic ²ux Φ through this circular surface?(1 Wb = 1 T m 2 ) Answer in units of Wb 009 10.0 points Will a pair of parallel current-carrying wires exert forces on each other? 1. No; the two wires attract each other by the magnetic Feld generated by their currents and repel each other due to the like charges of the moving particles in the wires. The two forces are equal in magnitude. 2. No; the magnetic Feld generated by the currents of the wires does not a³ect the wires themselves. 3. Yes; the magnetic Feld generated by the current in one wire is perpendicular to the current in the other wire and vise versa. 4. No; no net magnetic Feld is generated. 5. Yes; the wires are electrically charged. 010 (part 1 of 4) 10.0 points A long straight wire carries a current I and lies in the plane of a rectangular loop of N turns of wire as shown in the Fgure. A B C D I b a I N turns What is the magnitude of the magnetic Feld due to the long straight wire at a distance r away from it?
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