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When the magnetic flux through a single loop of wire increases by 30 Tm^2, an average current of 40 A is induced in the wire. Assuming that the wire has a resistance of 2.5 ohms,
(a) over what period of time did the flux increase?
(b) If the current had been only 20 A, how long would the flux increase have taken?
An electron remains in an excited state of an atom for typically 10-8 s. What is the minimum uncertainty in the energy of the state
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A bicycle with 0.80m -diameter tires is coasting on a level road at 5.6m/s. A small blue dot has been painted on the tread of the rear tire. What is the angular speed of the tires
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A 2.0-C charge moves with a velocity of (2.0i + 4.0j + 6.0k) m/s and experiences a magnetic force of (4.0i - 20j + 12k) N. The x component of the magnetic field is equal to zero. Find out the y component of the magnetic field.
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