help The figure below shows a top view of a bar that can slide on two frictionle

Question

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The figure below shows a top view of a bar that can slide on two frictionless rails. The resistor is R = 5.40 Ohm, and a 2.50-T magnetic field is directed perpendicularly downward, into the page. Let l = 1.20 m. Calculate the applied force required to move the bar to the right at a constant speed of 2.50 m/s. At what rate is energy delivered to the resistor? A magnetic field directed into the page changes with time according to B = 0.055 0t2 + 1.40, where B is in teslas and t is in seconds. The field has a circular cross section of radius R = 2.50 cm (see figure below). When t = 4.30 s and r2 = 0.020 0 m, what is the magnitude of the electric field at point P2? When t = 4.30 s and r2 = 0.020 0 m, what is the direction of the electric field at point P2? into the page perpendicular to r2 and clockwise perpendicular to r2 and counterclockwise out of the page

Explanation / Answer

1. force= ILB

but I=BVL/R

= 2.5*2.5*1.2/5.4

=1.389 A

so force= ILB

=4.167 N

b). power descipiated= i^2R

=10.41 W

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