At which point, a, b, or \(\mathrm{c}\), is the magnitude of the electric field the greatest?

Refer to Figure Q21.24, which shows equipotential lines in a region of space. The equipotential lines are spaced by the same difference in potential, and several of the potentials are given.

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y (m) 1.0- 0.5 0- -200 V OV 100 V b -0.5- 300 V- -1.0+ -1.0 -0.5 -x (m) 0.5 1.0 FIGURE Q21.24