The figure below shows a top view of a bar that can slide on two frictionless ra

Question

The figure below shows a top view of a bar that can slide on two frictionless rails. The resistor is R = 6.40 Ohm, and a 2.50-T magnetic is directed perpendicularly downward, int the page. Let l = 1.20 m. (a) Calculate the applied force required to move the bar to the right at a constant speed of 1.70 m/s. N (to the right) b) At what rate is energy delivered to the resistor? W A long solenoid with 1.95 times 10 turns per meter and radius 2.00 cm carries an oscillating current 1 = 7.00 sin 120 pit, where I is in amperes and t is in seconds. (a) What is the electric field induced at a radius r = 1.00 cm from the axis of the solenoid? (Use the following as necessary: t. Let E be measured in millivolts/meter and t be measured in seconds.) E =

Explanation / Answer

EMF = B*v*L

i = EMF/R

i = B*v*L/R

i = 2.5*1.7*1.2/6.4 = 0.796 Amp.

F = i*L*B*sin theta

F = 0.796*1.2*2.5*sin 90 deg = 2.388 N

B.

Power = Force*Velocity

P = 2.388*1.7 = 4.06 W

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