The radius of a circle is increasing at the rate of 0.7 cm/s. What is the rate of its circumference?

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4.4 cm/s.
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A point pole has a strength of 4? × 10-4 weber. The force in newtons on a point pole of 4? × 1.5 × 10-4 weber placed at a distance of 10 cm from it will be a.) 20 N. b.) 15 N. c.) 7.5 N. d.) 3.75 N.
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