Question: A solenoid is shown below. It has a length L, N loops, a cross-sectional area A, and a current I. When the length is doubled

A solenoid is shown below. It has a length L, N loops, a cross-sectional area A, and a current I. When the length is doubled what will be the magnetic field? magnetic field lines remained same Increased by a factor of 2 decreased by a factor of 4 decreased by a factor of 2Three coplanar parallel straight wires carry equal currents I to the left as shown below. Each pair of wires is a distance R apart. The direction of the magnetic force on the middle wire downward Zero DUS out of the page O into the page upward

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