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Inductive charging is used to wirelessly charge electronic devices ranging from toothbrushes to cell phones. Suppose the base unit of an inductive charger produces a $1.00 \times$ $10^{-3}-$ T magnetic field. Varying this magnetic field magnitude changes the flux through a 15.0 -turn circular loop in the device, creating an emf that charges its battery. Suppose the loop area is $3.00 \times 10^{-4} \mathrm{m}^{2}$ and the induced emf has an average magnitude of 5.00 $\mathrm{V}$ . Calculate the time required for the magnetic field to decrease to zero from its maximum value.

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Rutgers, The State University of New Jersey

Numerade Educator

University of Washington

Hope College

are the equation for To figure out who induced your mouth is be a math physical to the turns times ah, rate of change of magnetic flux. Barghouti s O that this is number of turns times d do tee off. Not. It feels strange to be tense area anytime's Cho san zero, which is one. So you have end times B times A over the time taken l t. Is equal to absolute. So we want to find out a teammate that subject, that's n times b times a over and use your mouth. So we have 15 loops. 15 uh, field strength is 10 to the negative. Three. Tesla an area is three times 10 to the negative war. You know, squared You divide by the average member if induced, which is five volts and debt time off nine times 10 to the negative. Seven seconds. So 70.9 microseconds.