In Figure 21 26. there is a uniform magnetic. field of magnitude B middot 2 8 an

Question

In Figure 21 26. there is a uniform magnetic. field of magnitude B middot 2 8 and directed into the plane of the paper in the region shown Outside this region the magnetic field is zero . A rectangular loop 0 20 m by 0.60 m and of resistance 2 Is being pulled into the magnetic field by an external force, as shown What is. the direction (clockwise of counterclockwise)of the current induced In the loop? calculate the magnitude of the external force Fext required to move the loop at a constant speed of v = 3.9 m / s the mass loop is 0008 kg

Explanation / Answer

(a) The direction of the induced current is counterclock wise and can be obtained from Fleming's right hand rule or lenz' law (b) The force required to pull is given by F = (B^2*l^2*v)/R Given B = 2.8 T l enght ofthe conductor l = 0.6 m velocity v = 3.9 m/s and Resistance R = 2 ohm Hence F = ((2.8)^2*(0.6)^2*3.9)/2 Gives F = 5.503 N

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