mead Phys 3B - E&M Lenz's Law Experiment 9: Induction Faraday's Law If your observations agree with your predictions, you may proceed. A) What should the deflections be as pull the S pole away from the front of the coil? Answer the question and test your answer by trying it. B) Now switch out the many turn coil for the few turn coil and repeat the previous step. How does the magnitude of the deflections compare to the many turn coil? Explain.(Phys 3B - E&M Experiment 9: Induction Lenz's Law Faraday's Law Situation 2 The N pole of the bar magnet approaches the front of the coil A) If the normal direction of the area is towards you, will the initial flux be positive, negative or zero? negative 50 S N B induced B) How is the flux changing during this motion? 10 & , =- B, A = - wwb QB = - B, A = - bow C) According to Lenz's Law, the induced magnetic field will oppose the change in flux. What direction will the induced magnetic field go? Will the current be clockwise(CW) or counterclockwise(CCW)? Explain. The induced magnetic field will oppose the original $change iA flax in Flux that caused it by right hand thumb rule we determined current going to clock wise direction D) Will this cause a positive or a negative deflection on the galvanometer, if any? negative Situation 3 A) The magnet is pulled back from the solenoid with the N side facing the solenoid., If the normal direction of the area is towards you, will the initial flux be positive, negative or zero? positive so B) How is the flux changing during this motion? C) According to Lenz's Law, the induced magnetic field will oppose the change in flux. What direction will the induced magnetic field go? Will the current be clockwise(CW) or counterclockwise(CCW)? Explain. D) Will this cause a positive or a negative deflection on the galvanometer, if any?Phys 3B - E&M Lenz's Law Experiment 9: Induction Faraday's Law Using the Galvanometer For the rest of the lab, you will be using a galvanometer. This device measures the difference in voltage of any source. It points to the side of higher voltage. So, A current flowing out of the right terminal causes a deflection to the right (a positive deflection). Any current moving out of the left terminal causes a deflection to the left (a negative deflection). in coming In other words, the galvanometer will point to side of outgoing current. Predictions and Observations - Predict first, then observe! 1. Construct the circuit shown below, using the many turn coil. Answer parts (A)- (D) for each situation first, then perform the experiment to see if your predictions were correct. Situation 1: Hold the bar magnet still in front of the coil with the N pole of the bar facing the magnet. A) If the normal direction of the area is towards you, will the initial flux be positive, negative or zero? zero B) How is the flux changing during this motion? not changing because that 9, = 42. ". DPR = 0 C) According to Lenz's Law, the induced magnetic field will oppose the change in flux. What direction will the induced magnetic field go? Will the current be clockwise(CW) or counterclockwise(CCW)? Explain. There is D) Will this cause a positive or a negative deflection on the galvanometer, if any