Activity 2: Find the Emf and Current A generator has 800 rectangular circuit loops each being 40.00 cm long. If the armature of radius 8.00 cm rotates at 95.0 radians/second in a radial magnetic field of 0.130 T, what is (a) the induced emf and (b) the current produced if the resistance in the wire is 15.0 0 Given: N = 800 loops L = 40.00 cm = 0.40 m r = 8.00 cm = 0.0800 m B= 0.130 T f= 95 radians R = 15.0 0 seconds Solution: (a) Total length of the wire in the loop L = 800 loops 0.400 m 1 loop = 320.0 m T = 1/f 95.0 rad/s = 0.0100/second V T 2(3.14)(0.0800m) 0.01005 = 50.24 m/s (b). The face of the loop of wire is perpendicular to B and v, so the emf is E = BLV - (0. 130 T) (320.0m) (50.24 m/s) = 2 0889.984 T.m?/s 2 090 v 2.0889.984 V 15.0 0 = 139.33 A or 139 AActivity 1: True or False Put a check mark on whether each statement is True or False. Statement True False 1. Doubling a loop of wire will not change the voltmeter reading. 2. The faster the wire moves, the larger voltmeter reading but the shorter the time it last. 6 3. If you shorten the length of the conductor in the magnetic field, the induced emf will be greater. 4. Strong magnetic field can be created by applying greater current 5. No electric field will exist if there is no currentActivity 3: Find the Direction A suspended bar magnet is free to rotate near a current -carrying coil. The current in the coil is shown by the curved arrow. What is the direction of the coil's magnetic field? Draw the coil and indicate your answer Draw here