Question

Please answer all three questions.

A 22.0 cm long solenoid carries a current of 150 mA, which sets up a magnetic field of strength 850 uT at its center. How many total turns does this solenoid have? Two straight wires, of lengths 2.5 m and 5.0 m, are placed a distance of 15.0 cm apart, with their lengths parallel. If they both carry currents of 10.0 A in opposite directions, what is the magnitude of the force between them, and is the force attractive or repulsive? coil loop (3 pts) The picture to the right shows a large circular coil that is concentric with a smaller circular loop. A current passes through the windings of the coil and remains constant while the loop is pulled away from the coil (out of the page). The coil remains fixed in place. What is the direction of the magnetic field produced by the coil at its center, and the direction of the induced current produced in the loop during this motion?

Answer 1

Answer 1) Given , dength: la 22 cm 22X10 -3 150X10 A Current ; I. 150 mA Magnetic field; 8 = 850 MT 850 x 10-1 No. of turns: N- ? Acording to the formula for magnetic fiedd due to solenoid; B MONI B x l = N e Mo I -6 - 2 9 850x10 x 22 x 10 -។ -3 -4 X3.14 X 10' x 150 x 10 992 turns 2) Given i ha 2-5 mi Lo = 5m IA Io 10A 2.5 m d = 15 cm. 5m of A 15cm Magnetic field on B. BA 2 Mo IA 2 Tid -7 4 TL x 10 x 10 2 2 211 x 15 x 10 1.33 x 10T Force on B due to Ai FBA Io ho BA

FBA 10 x 5 x 1.33 x 10 - 4 x 10 6.61 Magnetic field of B on A -1 BE MoIB hū X10 X 10 21 x 15x10-2 21d -5 1-33 x 10 Force on A by Bi FAO IA LA BB FAB -5 10 x 2,5 x 13 3 X 10 - 4 3.33 X to N Since the currents are opposite direction, the frowing in nature. forcu will be repulsive T Loop coil 3) From the diagram, the curient flows through the coil in the clockwise direction. Hence the magnetic field lines will be into the at the page center : Now the loop is pulled away from the coil; thus there will be a decrease in magnetic freld' According law; to counter act the induced current will start flowing ie the antic lockwise direction. Lena's law,