Question: Force F = (2.0 N) i - (3.0 N) k acts on a pebble with position vector r = (0.50 m) j - (2.0 m)

Force F = (2.0 N) i - (3.0 N) k acts on a pebble with position vector r = (0.50 m) j - (2.0 m) k relative to the origin. In unit-vector notation, what is the resulting torque on the pebble about?
(a) The origin and
(b) The point (2.0 m, 0, -3.0 m)?

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