An clectromagnetic scale consists of a small coil with N=220 turns mounted on one end of a balance beam and placed between the poles of an clectromagnet as shown in the figure. The radius of the coil is 0.6 cm and the length of the arm OA of the balance beam is 35 cm. When there is no current in the coil, the beam is horizontal. On passing a current of 26 mA through the coil, the equilibrium is restored by putting a mass of 82 mg on the balance pan A. Find the magnetic field in the region of the coil. S.

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A square coil of wire of side 2.35 cm is placed in a uniform magnetic field of magnitude 2.50 T directed into the page as in the figure shown below. The coil has 25.0 turns and a resistance of 0.780 . If the coil is rotated through an angle of 90.0° about the horizontal axis shown in 0.335 s, find the following. x xx x X X X xxx x xx x X Rotation axis (a) the magnitude of the average emf induced in the coil during this rotation mV (b) the average current induced in the coil during this rotation MA

A 2.00 cm diameter, 14.0 cm long solenoid has 60.0 turns and has a 1.00 cm diameter loop inside it. The loop has a resistance of 0.400 Ω. What is the current in the loop at 0.00600 s? The the maximum and the minimum current in the graph have the same magnitude which is 3.60 A.