True/False : A small plasticball has an excess negative charge on it. If a magne

Question

True/False: A small plasticball has an excess negative charge on it. If a magnet is placedclose to this ball, it will either attract or repel the ball,depending upon which pole is closer to the ball.

True/False: A parallel platecapacitor is connected across a 25 V battery. If, with the batterystill connected, you pull the plates apart until their separationis now twice what it originally was, the capacitance of theseplates, the energy stored in the capacitor, and the excess chargeon each plate are now all one half of what they originallywere.

Please include explanations!
Thanks you.

Explanation / Answer

(a)    true    when the magnet is brought nearer to theball the ball will be attracted or repeled depending upon the polethat is brought    nearer to it (b)    the energy stored in a capacitor is givenby    U = (1 / 2) C V2    depending on this form the answer istrue    depending on this form the answer istrue

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