7. Considering the idea of transformers, there are two primary types: step-up and step-down. For a step-up transformer,

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7. Considering the idea of transformers, there are two primary types: step-up and step-down. For a step-up transformer, the primary coil induces a larger potential difference, but smaller current in the secondary coil. For a step-down transformer, the primary coil induces a smaller potential difference, but larger current in the secondary coil. In our experiment, which kind of transformer did we create? Support your answer with evidence from this experiment.. 8. The magnetic field perpendicular to a circular coil of 8 turns and a 25 cm diameter changes from -3.35 T to +1.40 T in a period of 50 ms. Determine the change in magnetic flux as well as the size of the induced EMF. Would this change induce a clockwise or counter-clockwise current in the coil? Show your work.
Magnet on Side of Coil Right Right Right Right Right Right Right Right Left Left Left Left Left Left Left Left Pole Towards Coil North North North North South South South South North North North North South South South South Direction of Magnet Motion Into Coil Out of Coil Into Coil Out of Coil Into Coil Out of Coil Into Coil Out of Coil Into Coil Out of Coil Into Coil Out of Coil Into Coil Out of Coil Into Coil Out of Coil Speed of Magnet Motion Slow Slow Fast Fast Slow Slow Fast Fast Slow Slow Fast Fast Slow Slow Fast Fast Sign of Galvanometer Deflection + +++1+ - + L + - + 1 Direction of Current CW or CCW CCW CW CCW CW CBW ECW CW CCW CW CCW CW CCW CCW CW CCW CW Induced Current (μA) 4 -20 10 -12 6 -10 - 14 20 10 18 10 18 8 10 20
Primary Current (A) 0.2 0.4 0.6 0.8 1.0 Primary Current (A) 0.2 0.4 0.6 0.8 1.0 Sign of Galvanometer Deflection E Table 2.3: Magnetic Induction Based on External Field Strength - Increasing Field ("Closing") Sign of Galvanometer Deflection Amount of Iron Core Remaining + + Whole Core 2/3 Core 1/3 Core No Core + + Impact of Iron Core on Magnetic Induction + of Current CW or CCW CW CW + + + CW + сю CW Direction of Current CW or CCW CCW CCW COW (CW CCW Current (UA) Table 2.4: Impact of Iron Core - Increasing Field ("Closing") Sign of Galvanometer Deflection Direction of Current CW or CCW сси 18 40 24 CCW CCW CCW Induced Current (μA) 8 8 20 20 42 Induced Current (μA) 40 22 10