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Q1. For the situation, the magnetic field changes with time according to the expression B = (2.00t3 - 4.00t2 + 0.800)T, and r2 = 2R = 5.00 cm. (a) Calculate the magnitude and direction of the force exerted on an electron located at point P2 when t = 2.00 s. (b) At what time is this force equal to zero?

Q2. Assume the speakers are reconnected so that the 479 sounds they emit are exactly out of phase. At what positions are intensity maximum and minimum now?

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