We Can Figure This Out.org
Virtual Lab: SPM Piezoelectric Crystals
University of Virginia
© 2003-Present, John C. Bean
If we attach the positive lead of a battery to the top of this block, and the negative lead to its bottom, this will create a downward electric field through its volume. (Here we have used the symbol for a battery: two parallel lines, the longer on the positive side).

From the table at the right, we can see that this particular block should then stretch vertically.

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