Chapter 37, Problem 40A

If a car made of iron and steel moves over a wide closed loop of wire embedded in a road surface, will the magnetic field of Earth in the loop be altered? Will this produce a current pulse? (Can you think of a practical application of this?)

To determine

Whether the pulse is generated or not

Its practical application.

Explanation of Solution

Introduction:

The change in magnetic field induces the current pulses.

As the car moves, the magnetic field changes as the car is made of conductors such as iron or steel. The change in the magnetic field will induce the voltage in the circuit. This induces voltage which generates the electric current pulses.

This has a wide practical application. One example is that this pulse is used to trigger traffic signals to give the green light at an intersection.

Conclusion:

The change in the magnetic field produces a current pulse and is used in a traffic signal.