Figure 21.26 3.9m/s 0.2m ext 0.6m magnetic field region 6) In Figure 21.26, ther

Question

Figure 21.26 3.9m/s 0.2m ext 0.6m magnetic field region 6) In Figure 21.26, there is a uniform magnetic field of magnitude B 2.8 T ard 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 S2 is being pulled into the magnetic field by an external force, as shown. (a) What is the direction (clockwise or counterclockwise) of the current induced i loop? (b) 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 of the loop is 0.008 kg.

Explanation / Answer

a )

here from the figure

FB and Fext both are opposite in direction

so the direction is counter clock wise or anticlock wise

b )

the power is " P "

P = e2 / R

Fext v = e2 / R

Fext v = ( B L v )2 / R

Fext = B2 L2 v / R

= 2.82 X 0.22 X 3.9 / 2

Fext = 0.61152 N

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