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Lecture 2 - Charge mobility in conductors an electroscope...

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Charge mobility in conductors, an electroscope The top metal knob is connected to the metal bar and needle in the center, but insulated from the outer frame and the ground. Like-sign repulsion causes the needle to deflect if charge can be transferred to the inner part of the electroscope.
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Polarizing the electroscope Notice that the electroscope will indicate charge even if the rod is brought near, but not touching the top knob. A positive charge on the rod pulls negative charge to the knob, leaving the needles and support positively charged. What happens to the needle when the rod is removed? A. It does not move and remains deflected. B. It returns to its un-deflected position and stays there. C. It returns to its un-deflected position, and then deflects again.
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Induced charge on an electroscope If we generate charge separation (or polarization) by bringing the positive rod close to the electroscope and then touch the needle section, the positive charge on the needle will be grounded out, but the negative charge on the knob will be held in place by the charged rod. If we remove our hand from the needle and then pull the rod away from the knob, what will charge on the electroscope be? A. Positive. B. Zero. C. Negative.
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