111 Sp19 - Lab 05 - Grc X ⓘ file:///C:/Users/wheng/Downloads/111%20Sp19%20-%20Lab%2005%20-%20Group%20Report%20(Group%206)(1).pdf earth net bar Bbar tan 6 / Bearth 4. Complete the table below by measuring the compass needle orientation for different locations of the bar magnet along the ruler. The distance d is measured from the center of the compass (i.e. 10 cm mark) to the center of the bar magnet. Calculate the strength of bar magnet's field at each location to 3 significant figures, assuming the strength of the Earth's field is 0.5 Gauss (i.e. Bearth-0.5 Gauss) Orientation ofMagnetic Field of Compass Needle Distance Bar Magnet bar (Gauss) (cm) 30 35 40 45 50 60 70 80 50 40 30 20 10 10 2.38 1.68 1.15 0.728 0.353 0.353 0.281 0.140 4 O Type here to search 7:48 PM 3/18/2019 1

111 Sp19 - Lab 05 - Grc X ⓘ file:///C:/Users/wheng/Downloads/111%20Sp19%20-%20Lab%2005%20-%20Group%20Report%20(Group%206)(1).pdf earth net bar Bbar tan 6 / Bearth 4. Complete the table below by measuring the compass needle orientation for different locations of the bar magnet along the ruler. The distance d is measured from the center of the compass (i.e. 10 cm mark) to the center of the bar magnet. Calculate the strength of bar magnet's field at each location to 3 significant figures, assuming the strength of the Earth's field is 0.5 Gauss (i.e. Bearth-0.5 Gauss) Orientation ofMagnetic Field of Compass Needle Distance Bar Magnet bar (Gauss) (cm) 30 35 40 45 50 60 70 80 50 40 30 20 10 10 2.38 1.68 1.15 0.728 0.353 0.353 0.281 0.140 4 O Type here to search 7:48 PM 3/18/2019 1

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter11: Magnetic Forces And Fields

Section: Chapter Questions

Problem 78AP: (a) A 0.750-m-long section of cable carrying current to a car starter motor makes an angle of GOP...

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The Earths Van Allen belts (Fig. 30.34) are a natural magnetic bottle, trapping cosmic rays that spiral back and forth between the North and South Poles. Use the shape of a cosmic rays path to describe the variation in the magnetic field strength.
Is the direction of the magnetic field shown in Figure 24.6 (a) consistent with the right—hand rule for current (RHR-2) in the direction shown in the figure?
(a) An oxygen16 ion with a mass at 2.661026kg travels at 5.00106m/s perpendicular to a 1.20T magnetic field, which makes it move in a circular arc with a 0.231-m radius. What positive charge is on the ion? (b) What is the radio of this charge to the charge of an electron? (c) Discuss why the radio found in (b) should be an integer.
A mass spectrometer is being used to separate common oxygen- 16 from the much rarer oxygen-18, taken from a sample of old glacial ice. (The relative abundance of these oxygen isotopes is related to climatic temperature at the time the ice s deposited.) The ratio of the masses of these two ions is 16 to 18, the mass of oxygen-16 is 2.661026kg, , and they are singly charged and travel at 5.00106m/s in a 1.20-T magnetic field. What is the separation between their path when they hit a target after travet5ing a semicircle?
Neurons in our bodies carry weak currents that produce detectable magnetic fields. A technique called magnetoencephalography, or MEG, is used to study electrical activity in the brain using this concept This technique is capable of detecting magnetic fields as weak as 1.0 1015 T. Model the neuron as a long wire carrying a current and find the current it must carry to produce a field of this magnitude at a distance of 4.0 cm from the neuron.
Explain why the magnetic field would not be unique (that is, not have a single value) at a point in space where magnetic field lines might cross. (Consider the direction of the field at such a point.)
An alpha-particle ( m=6.641027kg , q=3.21019C ) travels in a circular path of radius 25 cm in a uniform magnetic field of magnitude 1.5 T. (a) What is the speed of the particle? (b) What is the kinetic energy in electron-volts? (c) Through what potential difference must the particle be accelerated in order to give it this kinetic energy?
A proton of speed v=6105m/s enters a region of uniform magnetic field of B = 0.5 T at an angle of q = 30° to the magnetic field. In the region of magnetic field proton describes a helical path with radius R and pitch p (distance between loops.) Find R and p.
A particle’s path is bent when it passes through a region of non-zero magnetic field although its speed remains unchanged. This is very useful for “beam steering’’ in particle accelerators. Consider a proton of speed 4106m/s entering a region of uniform magnetic field 0.2 T over a 5-cm-wide region. Magnetic field is perpendicular to the velocity of the particle. By how much angle will the path of the proton be bent? (Hint: the particle comes out tangent to a circle.
Why can a nearby magnet distort a cathode ray tube television picture?
Unreasonable results To construct a non-mechanical water meter, a 0.500-T magnetic field is placed across the supply water pipe to a home and the Hall voltage is recorded, (a) Find the flow rate through a 3.00-cm-diameter pipe if the Hall voltage is 60.0 mV. (b) What would the Hail voltage be for the same flow rate through a 10,0-cm- diameter pipe with tire same field applied?
If a cosmic ray proton approaches the Earth from outer space along a line toward the center of the Earth that lies in the plane of the equator, in what direction will it be deflected by the Earth’s magnetic field? What about an electron? A neutron?