The electro motive force (emf) induced in a loop of wire by a magnetic field is equal to A) The change in the electric flux B) The change in the magnetic field C) The change in the electric flux divided by the time it takes to change D) The change in the magnetic field divided by the time it takes to change
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- QUESTION 1 A coil of ten turns of area 0.01 m2 and resistance 5 Q is placed perpendicularly inside a magnetic field whose intensity and direction changes as given in the figure. What is the magnitude of the flux of magnetic field crossing the area of the coil at time = 6 sec? B(T) 0.1 0.3 0.5 0.8 0.9 t(s) -1 -2 O 2 Wb O 0.2 Wb O 20 Wb O 0.02 Wb O none of theseAn electrocardiogram (ECG) measures electric activity of neurons in the brain. Electroencephalograms and electromyograms respectively measure similar activity over the scalp and over the skin surrounding muscle cells. Because the electrical activity of the human body varies with time, the time-varying electric fields in the body lead to the generation of magnetic fields that can then be measured. The magnetocardiogram, developed in the 1960s, was the first such device. More recently, superconducting quantum interference devices (SQUIDS) have been used for these measurements. One important application of this technique is the monitoring of the fetal heart by measuring the magnetic field produced by currents in the heart at the surface of the mother's abdomen. The fetal heart at 28 weeks gestation can be modeled as a single-loop coil 1.50 cm in diameter, oriented so that the plane of the loop is parallel to the abdominal surface of the mother, and a magnetic field of 10.0 pT is typically…A few elements are naturally magnetic at room temperature. Select all that are True. Copper is ferromagnetic Zinc is ferromagnetic Nickel is ferromagnetic O Iron is ferromagnetic Cobalt is ferromagnetic Aluminum is ferromagnetic 00000
- A doctor monitors the flow rate of blood using an electromagnetic flowmeter. Electrodes A and Bmake contact with the outer surface of the blood vessel which has a diameter of 3 milimeters. For a magnetic field of 0.02T, an emf of 1.2 x 10 V is measured between the electrodes Calculate the speed of the blood in m/s. (The blood flow is out of the page.) Artery To voltmeter Blood flow ElectrodesA wire carrying a 5 A electric current is placed in a 2 T magnetic field. If there is no force exerted on the wire, what is known about the directions of the current and the magnetic field? there is no current in the wire the torque on the wire cancels out the force due to the magnetic field the wire is parallel to the magnetic field the induced magnetic field around the wire cancels out the effect of the applied magnetic field the wire is perpendicular to the magnetic fieldA 20 turn circular loop with diameter 3 cm is placed in a magnetic field of strength 7 T such that the loop’s area vector is parallel to the magnetic field. The magnetic field is reduced to 0 T over some time and this generates a constant voltage of 5 V. How long did it take for the magnetic field to reduce to 0? 3.23 s 15.32 s 0.0198 s 0.0389 s None of the above
- In which situation is there no end induced in a particular coil A Changing the magnetic field applied on the coil B moving the coil itself through a magnetic field C Suspending the coil within the magnetic field D Moving the magnetic field around the coilA 100-turn square wire coil of area 0.040 m² rotates about a vertical axis at 1,470 rev/min, as indicated in the figure below. The horizontal component of Earth's magnetic field at the location of the loop is 2.0 x 10-5 T. Calculate the maximum emf (in V) induced in the coil by Earth's field. V 20.0 cm 20.0 cm