Do not mind the erased work, it was incorrect.

b - Suppose that the tangential speed of the charged particle is increased to three times the original tangential speed (Vnew = 3vold). The magnetic B is fixed. What is the ratio fnew/ fold of the new frequency to the old frequency? [ Hint: f = 1/T and T = (2Tr)/v]5 pts. (6) An electric device requires 3.00 V, the plugging voltage is 110.0 V. What type of transformer is required for a proper use of this device? 10 pts. (7) A horizontal circular wire loop of radius R lies in a plane perpendicular to a uniform magnetic field B pointing from above into the plan of the loop. The magnitude of magnetic field B is: B = 0.80 T. If in At = 5.0 ms the wire is reshaped from a circle to a rectangle of dimensions: L = 10.00 cm; W = 8.50 cm, but remains in the same plane. a - What is the radius R of this circular wire loop ? ( 10 x 3.50 ) = 42.5 b - What is the magnitude of the average induced emf, c in the wire during this time? 1. 8 310 m 1 = 1:0. 80 7 ( 17. 15 ) A- 17.15 13. 72 5. OXID 3 10 pts. (8) An ideal transformer has a primary with M1 turns and secondary with N2 turns. The load resistor is R2 and the source voltage is Vsource. Given: N1 = 200.00; N2 = 50.00; R2 = 10.0 n and Vsource = 260.00 V. If a voltmeter across the resistor R2 reads a Vrms voltage of V2 = 40.00 V, what is the source resistance R1?10 pts. (13) A 5.00 cm high object is placed 36.0 cm from a concave mirror with radius of curvature R = 40.0 cm. a - Determine graphically (i) the position of the image, and (ii) the magnification of this mirror. I CO F A imageJ. b - Determine algebraically (1) the position of the image, /(ii) the magnication of this mirror. 5 pts (14) Figure 5 shows a double concave lens, and an object is : ced at the point 0. The focal points of this lens are at the points F and F', and ' - center of the lens is at the point C . Draw the image of this object. Figure 5: 10 pts. 415) Figure 6 shows a double convex lens, and an object is placed at the point 0. between the focal 'point F and the center 0 of the lens. a - Draw the image of this object. ' Figure 6: b How is the image? (hint: Chose one nature, one position and one size in the table) Nature of the image l Position 10 pts. (3) A horizontal wire carries a current /1 = 120.0 A dc. A second parallel wire at d = 10.0 cm above as shown in Figure 1, is set up such the upper wire carries enough current(12) so that it does not fall due to gravity. 1 2 ? NO meter *ma 1 1- 2 Figure 1: Force on parallel currents a - Using the point A as reference point in Figure 1, draw in Figure 1 all the forces acting on the upper wire. b - What should be the direction of current in upper wire? c - How much current /2 must the second wire carry so that it does not fall due to gravity? Given: The upper wire has a mass of 0.40 g per meter of length. ( 2.IT) ( 0 . 40 ) (9.8 ) ( 10.0 ) = 16 3 3 3 33, 32 14 :1 x 10 -7.) (120 ) 1. 6x 10 4 6 pts. (4) Consider the circular motion of a positively charged particle in the plane of this paper, due to a constant magnetic field B which points out of the paper. Neglect the effect due to gravity. a - Show that the radius of the orbit is giving by: mv r = qB