Tag: magnetism and electromagnetism

Questions Related to magnetism and electromagnetism

For a dynamo which one of the following statements is correct

physics magnetism and electromagnetism electric generator ac generator magnetic effects of electric current

  1. It converts electrical energy into light energy

  2. It converts kinetic energy into heat energy

  3. It converts mechanical energy into electrical energy

  4. It converts electrical energy into mechanical energy

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Correct Option: C
Explanation:

A  dynamo converts mechanical energy into electrical energy according to Faraday's Law of Electromagnetic Induction.


Answer-(C).

To convert mechanical energy into electrical energy, one can use

physics magnetism and electromagnetism electric generator ac generator magnetic effects of electric current

  1. DC dynamo

  2. AC dynamo

  3. motor

  4. (A) & (B)

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Correct Option: D
Explanation:

Dynamo is a device which converts mechanical energy into electrical energy.

Hence, both DC dynamo and AC dynamo can be used.

Hence, answer is option-(D)

The magnetic resonance imaging is used as a tool of diagnosis to detect the injuries in human body. It is based on the principle that:

physics magnetism and electromagnetism applications of electromagnets transformer transformers

  1. Protons in different types of human tissues have specific magnetic field environment

  2. Magnetic field pattern of human body resonates with the externally applied magnetic field

  3. Either $(1)$ or $(2)$

  4. Neither $(1)$ nor $(2)$

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Correct Option: A
Explanation:

The basic principle of MRI is protons in different types of human tissues have specific magnetic field environment.