1. Part of a sin gle rectangular loop of wire with dimensions shown in Fig. belo

Question

1. Part of a sin gle rectangular loop of wire with dimensions shown in Fig. below is situated inside a region ofuniform magnetic field of 0.6 T. The total resistance of the loop is 0.23 ? a culate the orce required to pull the loo p from the field (to the right) at a constant velocity of 3.1 m/s Neglect gravity. 0.8m A.0.8N B. 1.6 N C. 3.1 N D. None of above The two solenoids in the figure are coaxial and fairly close to each other. While the resistance of the variable resistor in the left-hand solenoid is increased at a constant rate, the induced current through the resistor R will, A. flow from a to b. B. flow from b to d C. be zero because the rate is constant. D. None of above. var Resistor with variable resistance

Explanation / Answer

here,

81)

magnetic feild , B = 0.6 T

velocity , v = 3.1 m/s

l = 0.4 m

the induced emf , V = B * v * l

V = 0.6 * 3.1 * 0.4 V = 0.74 V

the induced current , I = V/R

I = 0.74 /0.23 = 3.23 A

the force required , F = B * I* L

F = 0.6 * 3.23 * 0.4 N

F = 0.8 N

the force required is A) 0.8 N

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