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B.Tech EEE Magnetism — practice questions

Explore 72 free Magnetism questions in B.Tech EEE Electrical Engineering. Open each question or exercise to read its content, reference answers and available explanation.

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Magnetism questions and exercises with answers

Showing questions 1–30 of 72.

Which right hand rule is it?Read the answer and worked solution →True or false about magnetsRead the answer and worked solution →Close the magnetic formulasRead the answer and worked solution →Which field is stronger?Read the answer and worked solution →Tap only what fits the labelRead the answer and worked solution →Type the magnetism termRead the answer and worked solution →Tap the magnetism slipRead the answer and worked solution →Sunspots are magnetic features on the Sun. In what arrangement do they always occur?Read the answer and worked solution →Which set of elements is listed as showing strong magnetic effects, that is, as ferromagnetic?Read the answer and worked solution →The label ferromagnetic comes from the Latin word ferrum. What does ferrum mean?Read the answer and worked solution →How are the magnetic domains arranged inside a piece of iron that has never been magnetized?Read the answer and worked solution →Above which temperature can iron no longer be magnetized?Read the answer and worked solution →What kind of magnetic field does a current loop always produce?Read the answer and worked solution →Why can a ferromagnetic coating store digital information on a hard drive?Read the answer and worked solution →Which rare earth based material is named as a popular choice for strong permanent magnets?Read the answer and worked solution →Magnetic field lines can never cross one another. What does that rule guarantee about the field?Read the answer and worked solution →Electric field lines begin on positive charges and end on negative ones. How do magnetic field lines differ?Read the answer and worked solution →Why is a small compass a fair instrument for mapping a magnetic field?Read the answer and worked solution →What is the traditional short name for the magnetic field?Read the answer and worked solution →A charge q moves at speed v at an angle theta to a magnetic field of strength B. What is the magnitude of the magnetic force on it?Read the answer and worked solution →What name is often given to the force felt by a charge moving through a magnetic field?Read the answer and worked solution →The SI unit of magnetic field strength is named after which inventor?Read the answer and worked solution →In right hand rule 1, applied to a positive moving charge, what do the thumb and the fingers stand for?Read the answer and worked solution →A charged sphere is held at rest inside a strong uniform magnetic field. What magnetic force acts on it?Read the answer and worked solution →Why do charged particles often travel along magnetic field lines rather than cut across them?Read the answer and worked solution →A particle of mass m and charge q moves at speed v perpendicular to a uniform field B. What is the radius of its circular path?Read the answer and worked solution →An electron of mass 9.11 x 10^-31 kg and charge 1.60 x 10^-19 C moves at 6.00 x 10^7 m/s perpendicular to a 0.500 T field. What is the radius of its path?Read the answer and worked solution →Why do cosmic rays deliver a higher radiation dose at the poles than at the equator?Read the answer and worked solution →Which doughnut-shaped device uses magnetic fields to trap and steer reactive charged particles in fusion research?Read the answer and worked solution →Besides steering a particle beam, what other job do magnetic fields do inside a large particle accelerator?Read the answer and worked solution →

Worked practice questions

Which right hand rule is it?

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Left
RHR-1 force
Items
  1. Item
    Thumb along v
    Answer
    RHR-1 force
  2. Item
    Thumb along I
    Answer
    RHR-2 field
  3. Item
    Fingers curl round
    Answer
    RHR-2 field
  4. Item
    Palm pushes F
    Answer
    RHR-1 force
  5. Item
    Force on a charge
    Answer
    RHR-1 force
  6. Item
    Field round a wire
    Answer
    RHR-2 field
  7. Item
    Fingers along B
    Answer
    RHR-1 force
  8. Item
    B loops found
    Answer
    RHR-2 field
Right
RHR-2 field
Instructions
Swipe left for the rule that gives a force, right for the rule that gives a field.
_Source: OpenStax College Physics, section 22.9 Magnetic Fields Produced by Currents: Ampere's Law_

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True or false about magnets

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Questions
  1. Statement is true
    No
    Statement
    A magnet can be cut to leave a single north pole on its own.
  2. Statement is true
    Yes
    Statement
    Like magnetic poles repel and unlike poles attract.
  3. Statement is true
    Yes
    Statement
    The magnetic pole near the geographic North Pole is a south pole.
  4. Statement is true
    No
    Statement
    Magnetic field lines cross wherever two fields meet.
  5. Statement is true
    Yes
    Statement
    Magnetic field lines are continuous closed loops.
  6. Statement is true
    No
    Statement
    A charge sitting still feels a force in a magnetic field.
  7. Statement is true
    Yes
    Statement
    Heating iron past 1043 K destroys its magnetization.
Instructions
Swipe right for true, left for false.
_Source: OpenStax College Physics, section 22.1 Magnets_

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Close the magnetic formulas

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Missing parts
  1. Answer
    theta
    Choices
    1. theta
    2. phi
    3. lambda
  2. Answer
    r
    Choices
    1. A
    2. r
    3. l
  3. Answer
    n
    Choices
    1. N
    2. A
    3. n
Complete the statement
Force on a moving charge: F = q v B sin {0}. Field near a long straight wire: B = mu0 I over 2 pi {1}. Field inside a solenoid: B = mu0 {2} I.
Instructions
Tap the symbol that belongs in each blank.
_Source: OpenStax College Physics, section 22.9 Magnetic Fields Produced by Currents: Ampere's Law_

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