Electromagnetism- Quizzes

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    • A changing magnetic field can produce an electric current.
    • A current traveling toward you in a wire will have a magnetic field that encircles the wire in a counterclockwise fashion.
    • A galvanometer uses electromagnetism to measure small currents.
    • A magnetic field is generated perpendicular to the direction of current in a wire.
    • A wire is moving toward you through a magnetic field directed to your right. In what direction is the force?  Toward you; Place your thumb in the direction of the wire movement and your fingers in the direction of the magnetic field. Your palm points in the direction of the force. In this situation, the force is upward.
    • According to geologic evidence, Earth’s magnetic field has swapped its north and south poles several times over many years.
    • All charged particles are affected by magnetic fields.
    • Domains? In materials such as iron, nickel, and cobalt, groups of atoms are in tiny areas called
    • Effective current and voltage relate to alternating current.
    • Electromagnetic induction is the generation of current due to relative motion between a wire and a magnetic field.
    • Electromagnetic induction? The process by which an electric current is made by changing a magnetic field.
    • Electromotive force is the same as potential difference.
    • EMF is measured in volts, V.
    • If a magnetic field points upward and the current is to your left, the force is away from you.
    • If current is reduced in an electromagnet, what happens to the magnetic field strength? It is reduced. The stronger the current in an electromagnet, the stronger the magnetic field that is induced. If the current is reduced, then the magnetic field strength is reduced.
    • In a magnet, the domains are aligned, giving the magnet its strength.
    • In a magnet, the domains? Are aligned in the same direction
    • In demagnetised steel, the domains? Are in different directions
    • Magnetic force? The force of attraction or repulsion generated by moving or spinning electric charges
    • Magnetic materials are? Iron, nickel and cobalt
    • Magnetic poles? Points on a magnet that have opposite magnetic qualities
    • Repulsion between a magnet and another object indicates that? The other object is also a magnet
    • The ends of a magnet are called? Poles
    • The lines of a magnetic field go from? North pole to south pole
    • The magnetic field of a magnet? Weakens as the distance from the magnet increases
    • The magnetic flux per unit area is proportional to the strength of the magnetic field.
    • The second right hand rule is used to determine the direction of the magnetic field.
    • The small groups of atoms that behave like small magnets inside a large magnet are called? Domains
    • To demagnetise a magnet, one can? Drop or hit it for a period of time; heat it for some time
    • Two straight wires that are parallel to each other are carrying currents in opposite directions. What happens to the wires? They repel each other; Because the wires are carrying currents in opposite directions, the wires repel each other.
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    Medical Radiology News said:
    July 12, 2012 at 10:16 am

    Genitourinary Schistosomiasis: Life Cycle and Radiologic-Pathologic Findings

    Haytham M. Shebel, MD,
    Khaled M. Elsayes, MD,
    Heba M. Abou El Atta, MBBCh, PhD,
    Yehia M. Elguindy, MBBCh and
    Tarek A. El-Diasty, MD

    From the Department of Radiology, Urology and Nephrology Center, Mansoura University, Mansoura, Egypt (H.M.S., H.M.A., T.A.E.); and Department of Radiology, University of Texas M.D. Anderson Cancer Center, 1400 Pressler St, Houston, TX 77030 (K.M.E., Y.M.E.).

    Address correspondence to
    K.M.E. (e-mail: KMElsayes@mdanderson.org).

    Abstract

    Genitourinary schistosomiasis is produced by Schistosoma haematobium, a species of fluke that is endemic to Africa and the Middle East, and causes substantial morbidity and mortality in those regions. It also may be seen elsewhere, as a result of travel or immigration. S haematobium, one of the five fluke species that account for most human cases of schistosomiasis, is the only species that infects the genitourinary system, where it may lead to a wide spectrum of clinical symptoms and signs. In the early stages, it primarily involves the bladder and ureters; later, the kidneys and genital organs are involved. It rarely infects the colon or lungs. A definitive diagnosis of genitourinary schistosomiasis is based on findings of parasite ova at microscopic urinalysis. Clinical manifestations and radiologic imaging features also may be suggestive of the disease, even at an early stage: Hematuria, dysuria, and hemospermia, early clinical signs of an established S haematobium infection, appear within 3 months after infection. At imaging, fine ureteral calcifications that appear as a line or parallel lines on abdominopelvic radiographs and as a circular pattern on axial images from computed tomography (CT) are considered pathognomonic of early-stage schistosomiasis. Ureteritis, pyelitis, and cystitis cystica, conditions that are characterized by air bubble–like filling defects representing ova deposited in the ureter, kidney, and bladder, respectively, may be seen at intravenous urography, intravenous ureteropyelography, and CT urography. Coarse calcification, fibrosis, and strictures are signs of chronic or late-stage schistosomiasis. Such changes may be especially severe in the bladder, creating a predisposition to squamous cell carcinoma. Genital involvement, which occurs more often in men than in women, predominantly affects the prostate and seminal vesicles.

    2012

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