Question

9.37 the force per unit length/that is exerted by the wind on the 24 ft tall sail as a function of it height z is given by

Answer 1

The force between two parallel currents I1 and I2 that are spaced apart by r is measured as the ratio F/l.

If the currents are flowing in the same direction, the force is attracting; if not, it is repulsive. The pinch effect in electric arcs and other plasmas is caused by this force. The basic concept of the ampère derives from this force between two current-carrying wires: The strain on each wire is 2 x 10- 7 N/m if two long parallel wires spaced 1 m apart carry a current of 1 A each. The International System of Units' (Symbol: N) unit of force is the newton (SI).

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