Asteroids have a way of exploding when they approach a planet. They have an electrical charge at their core which fails to to equalize rapidly enough with the different charge of a planet which creates internal stresses that cause them to become bolides.
See Tunguska Event
http://www.thunderbolts.info/tpod/2006/arch06/060915tunguska1.htm
http://www.thunderbolts.info/tpod/2006/arch06/060918tunguska2.htm
A comet involved in the Chicago and Peshtigo fires:
http://www.thunderbolts.info/tpod/2006/arch06/060920chicagofire.htm
When Comets Break Apart
http://www.thunderbolts.info/tpod/2006/arch06/060825cometsbreak.htm
The Peekskill Meteor (it blew up)
http://www.thunderbolts.info/tpod/2006/arch06/060601meteor.htm
Comet Schwassman-Wachmann 3 Disintegrates 1 & 2
http://www.thunderbolts.info/tpod/2006/arch06/060505cometbreakup.htm
http://www.thunderbolts.info/tpod/2006/arch06/060508cometbreakup2.htm
Er, no.
That is just "Electric Universe" bunk.
Comets break up all the time because they are simply dirty snowballs with little structural strength, and many asteroids are little more than piles of rubble stuck together.
There is no reason to make up stuff about electric charges to explain processes that are the result of simple mechanics.