One hundred turns of (insulated) copper wire are wrapped around a wooden cylindrical core of cross-sectional area 5.87 × 10-3 m2. The two ends of the wire are connected to a resistor. The total resistance in the circuit is 14.9 Ω. If an externally applied uniform longitudinal magnetic field in the core changes from 1.93 T in one direction to 1.93 T in the opposite direction, how much charge flows through a point in the circuit during the change?
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Ответ:
The amount of charge that flow through a point is
Explanation:
From the question we are told that
The number of turns is
The area is
The total resistance is
The magnetic field in first direction is
The magnetic field in second direction is
The change in magnetic field is evaluated as
substituting values
The induced emf due to the change is mathematically evaluated as
This can also be mathematically represented as
Where I can be mathematically represented as
So
Now
=>
substituting values
Ответ:
0.0127 A
Explanation:
Power, P= VI where I is current flow and again V=IR where R is resistance
Making I the subject then
Substituting 10.0 W for P and 28.1 for R then