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

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Old Exam Questions Chapter 29 (Dr. Gondal Phys102) T081 Q 10. 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) Q26 . A very long wire carries a current I = 0.5 A directed along the negative x-axis. Part of the wire is bent into a circular section of radius R = 2.5 cm as shown in the figure. What is magnetic field at point C? (Ans: 16.6
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