The problem: The magnetic field through the square coil shown in the illustratio
ID: 1549430 • Letter: T
Question
The problem: The magnetic field through the square coil shown in the illustration is first steady and large (there are many turns in the coil, but only one is shown). The field then decreases to zero in about 1.0 s. A bulb connected to the ends of the coil indicates an induced current in the circuit. When are you most likely to observe light from the bulb? Proposed solution: A steady light will come from the bulb when the field is steady and large. The brightness of the light will decrease as the field decreases. There is no light when the magnetic field becomes zero.
18.2.2 Evaluate the solution The problem: The magnetic field through the square coil shown in the illustration is first steady and large (there are many turns in the coil, but only one is shown). The field then decreases to zero in about 1.0 s. A bulb connected to the ends of the coil indicates an induced current in the circuit. When are you most likely to observe light from the bulb? Proposed solution: A steady light will come from the bulb when the field is steady and large. The brightness of the light will decrease as the field decreases. There is no light when the magnetic field becomes zero. (a) Identify any errors in the proposed solution (b) Provide a corrected solution if there are errors.Explanation / Answer
a) The proposed solution is incorrect.
B) the current is induced only when there is a change in magnetic field through an area. So, there will be no current when the magnetic field is steady and large. The bulb glows only for 1 s. When there is sudden change in magnetic field.
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