[@The 42nd Gecko]

To be fair, nukes don't cause an EMP effect. The effect results from the nuke's extreme heat moving the ionasphere which causes the EMP effect.

http://www.askamathematician.com/2011/11/q-why-do-a-nuclear-weapons-cause-emps-electromagnetic-pulses/

This is a good article on how nukes cause EMPs.