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Indian Navy Pilot Magnetism & EMI — practice questions

Explore 6 free Magnetism & EMI questions in Indian Navy Pilot Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Magnetism & EMI questions and exercises with answers

Showing questions 1–6 of 6.

The energy stored in an inductor of inductance $L$ carrying a steady current $I$ is:Read the answer and worked solution →Newton's FIRST law is also called the law of:Read the answer and worked solution →The SI unit of force is the:Read the answer and worked solution →A block of mass 2 kg on a smooth incline at 30°. Acceleration down the incline (g = 10):Read the answer and worked solution →A pendulum of mass m swings to amplitude angle θ. At the lowest point of swing, the TENSION in the string equals:Read the answer and worked solution →Newton's laws — true or false?Read the answer and worked solution →

Worked practice questions

The energy stored in an inductor of inductance $L$ carrying a steady current $I$ is:

  1. $L I^2$
  2. $\dfrac{1}{2} L I^2$
  3. $\dfrac{1}{2} L^2 I$
  4. $LI$
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Correct answer: B. $\dfrac{1}{2} L I^2$

Work done by the source against the back-EMF while the current grows from $0$ to $I$ is $W = \int_0^I L i\,di = \dfrac{1}{2} L I^2$. This energy is stored in the magnetic field of the inductor.

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Newton's FIRST law is also called the law of:

  1. Inertia
  2. Action and reaction
  3. Gravity
  4. Friction
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Correct answer: A. Inertia

Law of Inertia: An object at rest stays at rest, and an object in motion stays in motion at constant velocity, unless acted upon by an unbalanced external force.

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The SI unit of force is the:

  1. joule
  2. newton
  3. watt
  4. pascal
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Correct answer: B. newton

Newton (N). 1 N = 1 kg·m/s² — the force that gives a 1 kg mass an acceleration of 1 m/s².

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