Stress tensor : tension VS Pressure

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zn52
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My question is regarding exercise 5.1 on page 141 of MTW. How come the tension and the pressure have the same value ? The field lines here are they the field lines of the electromagnetic force ?
Thanks,
 
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  • Textbook page showing the Maxwell stress-energy tensor equation (5.22), Exercise 5.1 with component equations T^00, T^0j and T^jk in terms of E and B (5.23), and the instruction to show the tension and pressure interpretation.
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