1. A circular loop of wire of radius a and resistance R is oriented in the ry-plane. A uniform magnetic field of magnitude B points in the +2-direction. If the loop of wire is rotated about the r-axis with an angular frequency w, what is the average power dissipated by Joule heating in the loop? (A) n²aªB®w²/2R (B) x²a*B*w²/R (C) 7²a*B?/2R (D) 0 (E) raBw/R

1. A circular loop of wire of radius a and resistance R is oriented in the ry-plane. A uniform magnetic field of magnitude B points in the +2-direction. If the loop of wire is rotated about the r-axis with an angular frequency w, what is the average power dissipated by Joule heating in the loop? (A) n²aªB®w²/2R (B) x²aBw²/R (C) 7²a*B?/2R (D) 0 (E) raBw/R

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

the magnetic field starts with a strength (B) of 50 mT into the paper and it decreases to zero and ends up changing direction to be 10 mT out of the paper in 2 ms. If a coil of square loops of wire parallel to the plane of the paper that is 10 cm on a side experiences that B change, how many loops must there be to get a total emf of 10 V?
You have a closed square loop of wire with length 44cm and a resistance of 750Ω. If there is a magnetic field of strength 0.2T going perpendicular through the loop at what rate (in T /s) does the magnetic field have to change in order to have a current of 0.2A through the loop?
A) A constantan wire of length 10 m and having a cross sectional area 1.5x10-4 m² is converted into 2-turn circular loop. It is connected to a voltage of 0.160 V. If the loop is placed in a uniform magnetic field of magnitude 0.80 T at an angle of 55, then calculate torque in the circular loop? (The resistivity (p) of constantan= 49 x10 -8 0.m.)
A) A constantan wire of length 12 m and having a cross sectional area 1.3x10-4 m² is converted into 2-turn square loop. It is connected to a voltage of 0.135 V. If the loop is placed in a uniform magnetic field of magnitude 0.65 T at an angle of 35 , then calculate torque in the square loop? If length is increased two time then what will be the effect on torque? (The resistivity (p) of constantan= 49 -8 х10 Ω.m.) (5 Marks) B) A small village station has two railway tracks (X and Y), made of different materials, for short range transportation. Both have initial length of 700 m. When temperature increases from 30C° to 45C°, then change in length for track 'X' is 0.1785 m and for track 'Y' is 0.3045 m. Through calculation, Identify the materials for track X and Y from table below. Explain which railway track will bend less if no gap is left and why? (3+2 Marks) Coefficient of Expansion (a), 1/C° Substance Aluminum 25 x 10-6 Brass or Bronze 19x 10-6 Brick 9x 10-6 Copper 17x 10-6 Glass…
4
On an electric stovetop, the elements consist of a thick metal strip/wire that is coiled and may or may not be visible. When supplied with current, by turning a dial or knob, we can heat a pot filled with water because Question 15 options: electrons leave the pot and enter the coil to heat it up. electrons in the coil create a magnetic field in the pot to heat it up. electrons leave the coil and enter the pot to heat it up. electrons in the coil encounter resistance and the coil heats up.
A strip of copper is placed in a uniform magnetic field of magnitude 3.5 T. The Hall electric field is measured to be 2.0 x 10-3 V/m. (a) What is the drift speed of the conduction electrons m/s)? m/s (b) Assuming that n = 8.0 x 1028 electrons per cubic meter and that the cross-sectional area of the strip is 4.4 x 10-6 m², calculate the current in the strip (in A). (in m³/C)? nq (c) What is the Hall coefficient m3/c
005 A uniform electric field of magnitude 5.06 x 10 V/m throughout a cylindrical volume re- sults in a total energy of 2.95 µJ. What magnetic field over this same region stores the same total energy? Answer in units of T.
A circuit is made with a resistor of resistance 25 ohms and a movable bar with length 15 cm moving to the left with speed 8 m/s. The whole circuit is in a magnetic field B = 1.5 T (into page). Use this set up to answer the following questions. What is the magnitude (no negative answers) of the power delivered to the resistor in watts? Answer to 4 decimal places.
A loop of highly conducting wire is placed in a magnetic field that is increasing out of the page (through the loop) at a rate of 1.80 T/s. If the loop has an area of 0.400m^2, calculate the current flowing in Amps through the 5.00 ohm resistor.
A flat coil of wire has an area A, N turns, and a resistance R. It is situated in a magnetic field, such that the normal to the coil is parallel to the magnetic field. The coil is then rotated through an angle of 90°, so that the normal becomes perpendicular to the magnetic field. The coil has an area of 1.5 × 10-³ m², 50 turns, and a resistance of 1902. During the time while it is rotating, a charge of 6.7 × 10-5 C flows in the coil. What is the magnitude of the magnetic field? X
A flat loop of wire consisting of a single turn of cross- sectional area 0.01 m^2 is perpendicular to a magnetic field that increases uniformly in magnitude from 2T to 8T in 3s. What is the EMF in the loop?