Item 5 Part A The lightbulb in the circuit shown in the figure(Figure 1) has a r

Question

Item 5 Part A The lightbulb in the circuit shown in the figure(Figure 1) has a resistance of 1352 and consumes 8.1 W of power; the rod is 1.39 m long and moves to the left with a constant speed. The strength of the magnetic field is 2.4T . Find the current in the circuit. Express your answer using two significant figures Submit My Answers Give Up | Figure l # 1 of 1 Part B Find the speed of the rod Express your answer using two significant figures external ·Fmagnetic m/s Submit My Answers Give Up

Explanation / Answer

here,

resistance of bulb , r = 13 ohm

let the EMf be V

power of bulb, P = 8.1 W

V^2/r = 8.1

V^2/13 = 8.1

V = 10.26 V

part A)

current in the wire , I = V/r

I = 10.26 /13

I = 0.79 A

the current in the circuit is 0.79 A

part B)

length of rod , L = 1.39 m

magnetic feild , B = 2.4 T

let the speed of rod be v

EMF = B * v * L

10.26 = 2.4 * v * 1.39

v = 3.08 m/s

the speed of rod is 3.08 m/s

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