![]() ![]() Want to cite, share, or modify this book? This book uses the ![]() The existence of induced electric fields is certainly not restricted to wires in circuits. For example, if the circular coil of Figure 13.9 were removed, an electric field in free space at r = 0.50 m r = 0.50 m would still be directed counterclockwise, and its magnitude would still be 1.9 V/m at t = 0 t = 0, 1.5 V/m at t = 5.0 × 1 0 − 2 s, t = 5.0 × 1 0 − 2 s, etc. These nonconservative electric fields always satisfy Equation 13.12. But what happens if d B / d t ≠ 0 d B / d t ≠ 0 in free space where there isn’t a conducting path? The answer is that this case can be treated as if a conducting path were present that is, nonconservative electric fields are induced wherever d B / d t ≠ 0, d B / d t ≠ 0, whether or not there is a conducting path present. When the magnetic flux through a circuit changes, a nonconservative electric field is induced, which drives current through the circuit.
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