A changing magnetic field induces current flow in conductors through electromagnetic coupling.

It induces current a conductor, and if the current is too large, the conductor or connections melt, like 'blowing' a fuse.

It induces a voltage across the gap of a condutor, and if the voltage is too large, a spark will 'jump' across the gap, or from the conductor to ground, like lightning. The resulting current can then melt conductors and connection, as above.

This effect is used in power transformers, in which the current through the primary windings induces a voltage in the secondary windings. Every size, from large utility to doorbell transfomers behaves this way.

ElectroMagnetic induction is commonly used in gasser engines. Interrupting current in the primary coil induces a rapidly-change in the field (it collapses very fast) which induces 15-25,000 volts in the secndary coil. This is sufficient to bridge the gap of the spark plug, and other unintended gaps as well.

The A-bomb produces fast-changing electric and magnetic fields. The speed of change is like a spike, or pulse, thus the name Electo- Magnetic Pulse (EMP)

The magnetic pulse then induces transient currents and voltages in conductors. Solid-state devices have small (microscopic) distances between conductors, and thus are very susceptible to overvoltages. EMP will thus 'fry' or 'burn out' solid state devices that have not been designed to withstand overcurrents and overvoltages.

Diesel engines will not be affected, BUT solid state devices, perhaps alternator voltage regulators, electronic diesel controls, ACC control, etc. in the car may be damaged.

Remember to "Duck and Cover"

Best Regards,
Jim