Some traffic lights use “induction loops” to detect cars. Using Faraday’s Law, explain how an induction loop detects cars to relay a signal to change the light.
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Some traffic lights use “induction loops” to detect cars. Using Faraday’s Law, explain how an induction loop detects cars to relay a signal to change the light.
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- 4A generator has a 460-turn coil that is 10 cm long and 12 cm wide. The coil rotates at 9.0 rotations per second in a 0.10-T magnitude B→ field. A)Determine the generator's peak voltage.A 2.4 Henry inductor is connected in series with a 12.0 Volt direct current battery, a 6.0 Ohm resistor, and a switch. The switch is open so no current is flowing in the circuit. Explain what happens to the current once the switch is closed. Intelligently use "Faraday's law" and "Lenz's law" and "time constant" in your explanation. Describe what a graph of current versus time would look like, what it's value would be at time = 0, and what its value would be after a very long time.
- 2. The current in a very long solenoid with radius a and n turns per unit length varies over time as i(t) = Ct². Concentric with the solenoid is a conducting ring of radius r. a) Write an expression for the potential difference induced in the ring. b) Write an expression for the magnitude of the electric field induced at an arbitrary point on the ring. c) Is the ring necessary for the induced electric field to exist? Radius = r Radius i(t) = Ct² -O V = V(t) = a17. The magnetic flux through three different coils is changing as shown in Figure P21.17. For each situation, draw a corresponding graph showing quantitatively how the induced emf changes with time. FIGURE P21.17 $(T•m²) 0.4 0.2 0 0 2 4 (T • mỏ) 0.4 0 01234 p(T•mỏ) +0.2 A 1 2 3 t(s) -0.2 -t (s)