Ch-29 - Old Exam Questions Chapter 29(Dr Gondal Phys102...

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Old Exam Questions Chapter 29 (Dr. Gondal Phys102) T081 Q10. Two long straight wires penetrate the plane of the paper at two vertices of an equilateral triangle as shown in Fig 6 . They each carry 2.0 A, out of the page. The magnetic field at the third vertex (P) has magnitude (in T): A) 1.7 × 10−5 Q12. A long, coaxial cable, shown in cross-section in Fig 8 , is made of two conductors that share a common central axis, labeled C . The current in the inner conductor is 2.0 A directed into the page and that in the outer conductor is 2.5 A directed out of the page . The distance from point C to B is 0.0030 m. What is the magnitude and direction of the magnetic field at point B ? ( Ans: 3.3 × 10–5 T, counterclockwise) Q13 . Solenoid 2 has twice the radius and six times the number of turns per unit length as solenoid 1. Find the ratio of the magnetic field in the interior of solenoid 2 to that in the interior of solenoid 1, if the two solenoids carry the same current. (Ans: 6) Fig.6, T081 Fig.8, T081 T072: Q23 .Two long parallel straight wires, at a separation d = 20.0 cm, carry currents i1 = 3.61 mA and i2 = 3.00 mA out of the page. At what distance from the origin on the x-axis shown in Fig. 1, is the net magnetic field due to the currents equal zero? (Ans: 11 cm) Q24. What are the strength and direction of the magnetic field at point P in Fig. 2 at the center of arcs, if the current in the loop is 5.0 A? (Ans: 79 μT into the page) Q25: A long solid cylindrical wire, of radius R = 2.00 cm carries a uniform current of 1.9 A. Find the magnetic field strength at a distance of 1 cm from the center of the wire. (Ans: 9.5 μT) Q27. We wish to generate a 0.10 T uniform magnetic field near the center of a 10 cm long ideal solenoid. What is the minimum number of turns needed, if the wire can carry a maximum current of 10 A? (Ans: 800) T071 Q23 . Two long straight, parallel wires are 3.0 cm apart. They carry currents I1 = 3.0 A and I2= 5.0 A in opposite directions, as shown in the figure 1. At what point, beside infinity, could the magnetic field be zero? (Ans: A) Q24. A cylindrical wire of radius R carries current I uniformly distributed across its cross-section. Find the magnetic field inside the wire at r < R from the axis. (Ans: B= μ 0 i r/(2 π R 2 )) Q25. A magnetic field of 0.10 T is generated near the center of a 10 cm long solenoid. How many turns are needed if the current in the wire is 10 A? (Ans: 796) Q27. What is the magnetic field at the center of the loop in the figure 2. (Ans: 2.1 10 -4 T into the page) Fig 1, T072 Fig 2, T072 Fig 1, T071 Fig 2, T071 1
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T062 Q24. The figure 1 shows four wires carrying equal currents and four Amperian loops. Rank the loops according to the magnitude of B ds r r Ñ along each, greatest first. (Ans: c, b and d tie, then a ) Fig. 1, T062 Fig. 2, T062 Q25 . Four long straight wires carry equal currents into the page as shown in the figure 2 . The direction of the net magnetic force exerted on wire A by the other three wires is: (Ans: East)
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This note was uploaded on 11/03/2010 for the course PHYSICS 303 taught by Professor Shih during the Spring '10 term at University of Texas.

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Ch-29 - Old Exam Questions Chapter 29(Dr Gondal Phys102...

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