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Q. The time constant of an RC circuit is 5.5 s. How much time t is required for the capacitor (uncharged initially) to gain one-half of its full equilibrium charge?

Q. A 1.10 m long straight wire section has a resistance R = 34.0 ohm and is connected, with conducting wire of negligible resistance, to a 6.00 V battery. The wire is located in a uniform magnetic field B directed perpendicular to that section of wire. Calculate the magnitude of B when the force on the wire due to B has a magnitude of 0.170 N.

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