Consider the following experimental setup. A single loop of conducting wire is c

Question

Consider the following experimental setup. A single loop of conducting wire is connected to a resistor as shown in the diagram. A magnet is then taken and passed through the wire at a constant speed, north side first. Which of the following graphs correctly represents the current through the resistor as the magnet passes through it? (Circle one) Take current flowing to the right to be positive. Suppose that the magnetic flux changes from 4.90 Wb to 2.70 Wb in a time of 0.32 s. What is the energy dissipated through the resistor during this time (resistance = 0.4 Ohm)? Suppose that the speed with which the magnet moves is constant and equal to 0.60 m/s. What is the minimal magnetic force (assumed to be constant) that the magnet would feel during the 0.32 s interval? In a television set the power needed to operate the picture tube comes from the secondary coil of a transformer. The primary coil of the transformer is connected to a 120-V receptacle on a wall. The picture tube of the television set uses 104 W and has a resistance of 18.9 k Ohm. Find the turns ratio N_s/N_P of the transformer.

Explanation / Answer

Induced emf

E=-d(phi)/dt =-(2.7-4.9)/0.32=6.875 Volts

power dissipated in resistor

P=E2/R=6.8752/0.4=118.2 Watts

since

P=FV

F=P/V=118.2/0.6=196.94 N

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