A circular loop of wire of radius r = 0.0638 m and resistance R = 2.16 2 rotates about an axis through its center which is perpendicular to a constant magnetic field of magnitude B = 3.84 T. If the loop rotates with frequency f = 20.0 s, what is the total energy dissipated in the loop in one revolution?i Hint

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A loop of wire has the shape shown in the drawing. The top part of the wire is bent into a semicircle of radius r = 0.28 m. The normal to the plane of the loop is parallel to a constant magnetic field (p = 0°) of magnitude 0.82 T. What is the change AO in the magnetic flux that passes through the loop when, starting with the position shown in the drawing, the semicircle is rotated through half a revolution? B (into paper) ΔΦ = i

A circuit is made with a resistor of resistance 25 ohms and a movable bar with length 15 cm moving to the left with speed 8 m/s. The whole circuit is in a magnetic field B = 1.5 T (into page). Use this set up to answer the following questions. What is the magnitude (no negative answers) of the power delivered to the resistor in watts? Answer to 4 decimal places.

A 5-turn conducting loop with a radius of 3.0 cm with axis of rotation in the plane of the paper spins at 60 revolutions per second in a magnetic field of 0.50 T that is perpendicular to the paper. The maximum emf generated is:     0.14 V     8.3 V     28 V      2.7 V     10.5 V

The figure shows a 40-turn loop with dimensions I = 6.5 m and w = 1.8 m carrying a current I = 7.7 A immersed in a uniform 0.62-T magnetic field in the +z-direction. Calculate the work required by an external force to rotate the loop from = 50° to 31°. X W B TRO I L