Bin x x x × x X X X x X 5) A metal crossbar of mass m=75 g rides on a pair of long, horizontal conducting rails separated by a distance L=60 cm and connected to a device that applies constant current | = 3A to the circuit, as shown below. A uniform magnetic field is established going into the page, as shown. a) If the coefficient of static friction is μs 0.20, find the minimum field B necessary to start the bar moving. b) In which direction does the bar move? Constant current source X x x x × × ×

Bin x x x × x X X X x X 5) A metal crossbar of mass m=75 g rides on a pair of long, horizontal conducting rails separated by a distance L=60 cm and connected to a device that applies constant current | = 3A to the circuit, as shown below. A uniform magnetic field is established going into the page, as shown. a) If the coefficient of static friction is μs 0.20, find the minimum field B necessary to start the bar moving. b) In which direction does the bar move? Constant current source X x x x × × ×

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Loop in changing B-field (2 parts): Use this setup for the next 2 questions A 10cm x 10cm square loop sits the xy-plane and has resistance of 0.2 Ohms, and sits in a uniform magnetic field in the z-direction that is changing with time according to: B₂ (4t - 2t²) where the z is the direction perpendicular to the loop, B is measured in Tesla, and t is measured in units of seconds. Denote positive current as current flowing in the CCW direction looking down at the loop (z axis pointing out of the page). Question 13 = Loop in changing B-field (Part 1/2): What is the current in the loop at time t=0s? Question 14 Loop in changing B-field (Part 2/2): What is the current in the loop at time t=1.9s?
A ten-turn solenoid has a ferromagnetic core with a relative permeability of 10,000. The length of the solenoid is l=10 cm and its cross section area is A=1 cm2. The amount of current driving the solenoid is 0.1 A. Determine the magnetic energy density in the core. Provide an answer in milli Joules per cubic meter. Round off to one decimal.
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Q1. Calculate the force of attraction on the armature of the cast steel electromagnet shown below when the flux is 1.2 Tesla in the air-gap and determine the total mmf required to produce this magnetic flux density. Draw the equivalent circuit taking into account leakage or fringing effect and find the magnetic circuit inductance. 400 t μ = 0.5 H/m -60 cm Lg=1m A = 20 cm² -20 cm
4. A loop of wire with radius R 2 cm carries a current I whose magnitude increases at 2 A/s in the clockwise direction as shown. The inner loop is made of copper with a resistance of 1 /cm and a R2 1 cm. RI R2 a. What is the magnitude of the induced current in the inner loop? For simplicity's sake assume that the magnetic field is uniform within the loop. b. What is the direction of the induced current in the inner loop? Justify your answer.
While the two parallel ends shown in the figure are connected to each other with a metal rod, the other two ends are free. A conductive rod can slide freely on the rails.The speed of the stick is constant.In the figure, there is a magnetic field perpendicular to the plane and in the direction of which the size is 35 tesla.a) Since the distance between the rails is 25cm and the speed of the conductor rod is 55cm / sec, find the emk formed in the abcd frame consisting of the rail and the conductor rod.b) The resistance of the conductive rod is 18 ohms. If the resistance of the rails is neglected, find the current passing through the rod.c) What should be the magnitude of the external force that must be applied to the rod so that it can maintain its movement at a constant speed?d) Calculate the work done by the external force per unit time.e) Show that this work is equal to the heat energy spent on the rod resistance.
Two long, parallel conductors, separated by 14.0 cm, carry currents in the same direction. The first wire carries a current I = 4.00 A, and the second carries 1₂ = 8.00 A. (See figure below. Assume the conductors lie in the plane of the page.) 1₂ # (a) What is the magnetic field created by I, at the location of I? magnitude T direction Select-- v (b) What is the force per unit length exerted by I, on 1₂? magnitude N/m direction Select- (c) What is the magnetic field created by I₂ at the location of 1₁? magnitude direction -Select-- (d) What is the force per length exerted by 1₂ on 1₁? magnitude N/m direction -Select--
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Magnetic field Need to make an illustration (identifying the variables)
2. A solenoid is 1 Cm long with a diameter of 0.5 Cm. The core is SiFe with a relative permeability of 4200. Assuming a current of 100 mA, what is the maximum number of turns for the winding that keeps the core under the saturation magnetic field of about 1.5 Tesla?
Consider the magnetic circuit shown below. The primary coil has N1=400 turns, and the secondary coil has N2=800 turms. The total length of the core (shown in red) is 5 cm. The core has a uniform cross section 2 cm2 , magnetic permeability 900. Calculate the total inductance between terminals a and b, if the coils are connected as shown below. Assume that there is no flux leakage from the core. N1 N2