In the figure below, the rolling axle, 2.90 m long, is pushed along horizontal rails at a constant speed v = 12.00 m/s. A resistor R = 0.4000 N is connected to the rails at points a and b, directly opposite eachother. The wheels make good electrical contact with the rails, so the axle, rails, and R form a closed-loop circuit. The only significant resistance in the circuit is R. A uniform magnetic field B = 0.0300 T is verticallydownward.Bb.(a) Find the induced current I in the resistor.A(b) What horizontal force F is required to keep the axle rolling at constant speed?N(c) Which end of the resistor, a or b, is at the higher electric potential?O Point a is at a higher potential.Point b is at a higher potential.O Point a and point b are at equal potentials.(d) After the axle rolls past the resistor, does the current in R reverse direction?O YesNo

Answered: Image /qna-images/answer/caf25b9f-b5de-4045-9b38-54045480039c.jpg

In the figure below, the rolling axle, 2.90 m long, is pushed along horizontal rails at a constant speed v = 12.00 m/s. A resistor R = 0.4000 N is connected to the rails at points a and b, directly opposite each other. The wheels make good electrical contact with the rails, so the axle, rails, and R form a closed-loop circuit. The only significant resistance in the circuit is R. A uniform magnetic field B = 0.0300 T is vertically downward. (a) Find the induced current I in the resistor. (b) What horizontal force F is required to keep the axle rolling at constant speed? |N (c) Which end of the resistor, a or b, is at the higher electric potential? O Point a is at a higher potential. O Point b is at a higher potential. O Point a and point b are at equal potentials. (d) After the axle rolls past the resistor, does the current in R reverse direction? O Yes O No

In the figure below, the rolling axle, 2.90 m long, is pushed along horizontal rails at a constant speed v = 12.00 m/s. A resistor R = 0.4000 N is connected to the rails at points a and b, directly opposite each other. The wheels make good electrical contact with the rails, so the axle, rails, and R form a closed-loop circuit. The only significant resistance in the circuit is R. A uniform magnetic field B = 0.0300 T is vertically downward. (a) Find the induced current I in the resistor. (b) What horizontal force F is required to keep the axle rolling at constant speed? |N (c) Which end of the resistor, a or b, is at the higher electric potential? O Point a is at a higher potential. O Point b is at a higher potential. O Point a and point b are at equal potentials. (d) After the axle rolls past the resistor, does the current in R reverse direction? O Yes O No

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter29: Dc Generators

Section: Chapter Questions

Problem 1PA: You are working as an electrician in a large steel manufacturing plant, and you are in the process...

See similar textbooks

Similar questions

What are interpoles, and what is their purpose?
For a motor design, you need to design a solenoid coil that produces a magnetic flux density (B) of at least 2000 gauss when a 10 mA current flows through the conductor. Due to space limitations, the coil only can be 10 turns over a 1 cm length. To obtain the needed performance, go to Table 3 and choose a core material for the coil.
A rod with mass m = 0.720 kg and radius r = 6.00 cm rests on two parallel rails, as shown in the figure. The rails are separated by a distance d = 12.0 cm and have length L = 45. cm.The rod carries a current I = 48.0 A in the direction shown in the figure and rolls on the rails without slipping. There is a uniform magnetic field of magnitude B = 0.240 T perpendicular to the rails and the rod. If the rod starts from rest, what is its speed when it leaves the rails?
A square loop of wire is oriented in a 12-tesla magnetic field directed to the left as shown. The loop has a side length of 30 cm. At time t = 0, the loop is connected to a battery that results in 4 amps of current traveling counter-clockwise through the loop. Determine the magnitude and direction of the net torque acting on the loop the instant after the battery is connected. For the direction, imagine that you are looking at the loop from above.
The circuit shown in the given figure is a model of a solenoid, such as that used to engage the gear of a car’s starter motor to the engine’s flywheel. The solenoid is constructed by winding a wire around an iron core to make an electromagnet. The resistance R is that of the wire, and the inductance L is due to the electromagnetic effect. When the supply voltage vs is turned on, the resulting current activates the magnet, which moves the starter gear. Obtain the model of the current i given the supply voltage vs.
Consider the magnetic circuit has a length of 0.6 m an area of 0.0018 m2 and a single airgap of length 2.3 mm. The circuit is energised by a coil. If the core permeability is 1000, by making suitable approximations calculate: (i) the number of turns required to achieve an inductance of 12 mH; (ii) the inductor current which will result in a core flux density of 1.0 T; (iii) A particular application uses the same magnetic core but requires the airgap flux density to be increased by a factor of 1.5 while maintaining the inductance below 17mH. Design a magnetic circuit to do this. (iv) For your design, determine the maximum RMS voltage that can be applied to the coil to ensure that the peak flux remains below 1.5 T
Two coils that are separated by a distance equal to their radius and that carry equal currents such that their axial fields add are called Helmholtz coils. People in science and industry use coils like this to make regions where the net magnetic fields are relatively uniform (but not perfectly uniform). Let R=0.12 cm, I=22 A, and N=320 turns for each coil. Place one coil in the y-z plane with its center at the origin and the other in a parallel plane at R=0.12 cm. Calculate the resultant field Bx at x1=0.03 cm, x2=0.06 cm, x3=0.08 cm, and x4=0.12 cm. For my answers I got B1 = .00416 T, B2 = .00353 T, B3 = .00306 T, and B4 = .00221 T all of which were wrong. Can you please help me?
FUNDAMENTALS OF DEFORMABLE BODIESThe tank shown in figure is fabricated from 10 mm steel plate. Determine the maximum longitudinal and circumferential stresses caused by an internal pressure of 1.2 MPa. Given: t = P = Required: Maximum Longitudinal Stress (σL) Maximum Circumferential Stress (σT)
An electric toothbrush has a base designed to hold the toothbrush handle when not in use. As shown, the handle has a cylindrical hole that fits loosely over a matching cylinder on the base. When the handle is placed on the base, a changing current in a solenoid inside the base cylinder induces a current in a coil inside the handle. This induced current charges the battery in the handle. We can model the base as a solenoid of length ℓ with NB turns (as shown), carrying a current i, and having a cross-sectional area A. The handle coil contains NH turns and completely surrounds the base coil. Find the mutual inductance of the system.
Q)In steady magnetic fields, can we define a potential function based on the current distribution from which the magnetic fields may be easily determined? Justify your answer.
A magnetic material has a relative permeability of 3500. A magnetic circuit is constructed using this material of length 0.35 m and area 0.02 m2. Design a coil with a suitable number of turns and current flow to establish a magnetic flux density of 1.0 T in the material while maintaining a coil inductance less of than 500 mH.
The two coils A and B wound coaxially on an insulating cylinder. It will be evident that the ﬂuxes produced by a current i through the two coils are in the same direction, and the coils are said to be cumulatively coupled. If the direction of the current in B relative to that in A is reverse, then coils are said to be differential coupling. Suppose A and B to have self-inductances and henrys respectively and a mutual inductance M henrys. If two coils are connected in series, their effective inductance is found to be 12.0H. However, when the connections to one coil are reversed, the effective inductance is 8.0 H. If the coefﬁcient of coupling is 0.6. a) Show that the total inductance of inductively coupled circuits is + ± 2M b) Calculate the self-inductance of each coil and the mutual inductance.