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Yes and no.

For a nuclear explosion to produce an EMP of enough strength to do damage beyond the range of the blast, thermal flash, prompt radiation, etc. it must occur in the ionosphere, where it can push large amounts of ionized gas large distances through the earth's magnetic field, causing an induced current of billions of amperes in that gas. This EMP can affect an area 1000 miles or more in radius around surface zero. It has been calculated that 3 properly placed nuclear explosions of the right yield in the ionosphere over the continental US would kill the entire US power grid and all solidstate electronics.

Ordinary air or surface bursts do not produce enough EMP for it to even be included in nuclear effects calculations.

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