Which of the following statements is crue concerning the induced current in a co

Question

Which of the following statements is crue concerning the induced current in a coil of wire for a magnet approaching or moving away from the coil? The induced magnetic field repels an approaching magnet. The induced magnetic field attracts a departing magnet. The induced magnetic field always opposes the motion of the magnet. All of the above statements are correct. A device uses the resonant frequencies of the magnetic moment of protons placed in a high magnetic field to image tissue inside the human body. This device is known as a(n) - MCI. CAT scan. PET scan. MRI. Which of the following statements describes how a generator functions? A generator changes the voltage of a circuit by changing the magnetic flux. A generator stores electrical energy and discharges it when prompted. A generator uses physical work to rotate magnets thereby inducing an electrical current. A generator uses electrical energy to generate a magnetic field that causes physical work. Accord

Explanation / Answer

7) D

If an induced current flows, its direction is always such that it will oppose the change which produced it.So the magnetic field will always oppose the change which induced it

8)D

MRI-Magnetic resonance imaging (MRI) is a noninvasive medical test that physicians use to diagnose and treat medical conditions. MRI uses a powerful magnetic field, radio frequency pulses and a computer to produce detailed pictures of organs, soft tissues, bone and virtually all other internal body structures.

9)A

An Electrical Generator is a device that produces an Electromotive Force (e.m.f.) by changing the number of Magnetic Flux Lines (Lines of Force), , passing through a Wire Coil.

10)B

Michael Faraday did experiments that showed that induced e.m.f for a coil of wire depends on four things:

Magnetic strength of the core in the coil of wire. (stronger --> bigger emf)

Number of turns of wire in the coil (more turns --> bigger emf)

The cross-sectional area of the coil (bigger area --> bigger emf). (This could also be seen as theangle you point the magnet at the coil, because flux linkage is basically the same as flux cutting.)

How fast you move the magnet into/out of the coil. (Faster --> bigger emf)

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