For which of the following force fields the potential energy is not defined? A. F, = 2yz(1 – 6xyz), F, = 2xz(1 – 6xyz), F, = 2xy(1 - 6xyz) %3D %3D B. F. = y? + 22 + 2(xy – yz + zr), F, = z? + x? + 2(ry + yz + zr), F, = x² + y? + 2(xy + yz + zx) %3D C. F, = 2r'yz, F, = 2xy²z, F, = 2ryz? D. F, = 1/(a² + y? + 2²), F, = y/(a² + y² + z²), F, = 2/(x² + 3? + 2?) %3D
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