Practice Problems 2

# Practice Problems 2 - Shaleen Shukla Physics 12 – Spring 2009 1 Practice Problems 2(UNC 1 pt A single conducting loop of wire has an area of

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Unformatted text preview: Shaleen Shukla- Physics 12 – Spring 2009 1 Practice Problems 2 (UNC) 1 pt A single conducting loop of wire has an area of 7.31E-2 m 2 and a resistance of 117 Ω. Perpendicular to the plane of the loop is a magnetic field of strength 0.112 T. At what rate (in T/s) must this field change if the induced current in the loop is to be 0.256 A? (in T/s ) 1 . A 4 . 10 × 10 2 B 5 . 45 × 10 2 C 7 . 25 × 10 2 D 9 . 64 × 10 2 E 1 . 28 × 10 3 1 pt A square loop of wire with a small resistance is moved with constant speed from a field free region into a region of uniform B field (B is constant in time) and then back into a field free region to the right. The self inductance of the loop is negligible. . When leaving the field the coil experiences a magnetic force to the left. 2 . A True B False . Upon leaving the field, a clockwise current flows in the loop. 3 . A True B False . Upon entering the field, a clockwise current flows in the loop. 4 . A True B False . When entering the field the coil experiences a magnetic force to the left. 5 . A True B False 1 pt The figures below show two different situations where a current may be induced in a loop according to Faraday’s Law, with the direction given by Lenz’ Law. The magnetic field is shown by the x’s in Fig. 2. Select true or false for the current in the loop. (The compass directions are defined in the usual way.) N S a b fig 1. a b fig 2. . fig1: Magnet moving West, induced current ’a’. 6 . A True B False . fig2: Loop moving East, induced current ’b’. 7 . A True B False . fig1: Magnet moving East, induced current ’a’. 8 . A True B False . fig2: Loop moving North, induced current ’b’. 9 . A True B False . fig1: Loop moving West, induced current ’a’. 10 . A True B False . fig2: Loop moving South, no induced current. 11 . A True B False 1 pt A metal rod 0.499 m long moves with a speed of 1.91 m/s perpendicular to a magnetic field. If the induced emf between the ends of the rod is 0.750 V, what is the strength of the magnetic field? (in T ) 12 . A 6 . 30 × 10- 1 B 7 . 87 × 10- 1 C 9 . 84 × 10- 1 D 1.23 E 1.54 1 pt A 1.43 m wire is wound into a coil with a radius of 3.36 cm. If this coil is rotated at 94.8 rpm in a 0.0662 T magnetic field, what is its maximum emf? (in V ) 13 . A 3 . 57 × 10- 3 B 5 . 18 × 10- 3 C 7 . 51 × 10- 3 D 1 . 09 × 10- 2 E 1 . 58 × 10- 2 Shaleen Shukla- Physics 12 – Spring 2009 3 Practice Problems 2 (UNC) 1 pt A generator is designed to produce a maximum emf of 164 V while rotating with an angular speed of 3468 rpm. Each coil of the generator has an area of 0.0102 m 2 . If the magnetic field used in the generator has a magnitude of 0.0485 T, how many turns of wire are needed?...
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## This note was uploaded on 11/27/2011 for the course PHYS 105 taught by Professor Walker during the Fall '08 term at UNC.

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Practice Problems 2 - Shaleen Shukla Physics 12 – Spring 2009 1 Practice Problems 2(UNC 1 pt A single conducting loop of wire has an area of

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