Equipotential Surface and Properties Quiz

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Questions and Answers

What is an equipotential surface?

  • A surface with varying potential at different points
  • A surface with no electric field lines passing through
  • A surface where every point has the same potential (correct)
  • A surface only applicable in magnetic fields

Which property of an equipotential surface ensures no work is done in moving a test charge?

  • Electric field is tangential to the surface
  • Electric field lines are parallel to the surface
  • Electric field lines intersect on the surface
  • Electric field is always normal to the surface (correct)

What condition must be satisfied for total internal reflection to occur?

  • Angle of incidence is equal to the critical angle
  • Angle of incidence is less than the critical angle
  • Light travels from a denser to a rarer medium (correct)
  • Light travels from a rarer to a denser medium

Why do electric field lines never cross each other?

<p>To avoid confusion in the direction of the electric field (B)</p> Signup and view all the answers

Why are electrostatic field lines always normal to the surface of a conductor?

<p>To prevent tangential components causing electrons to move along the surface (A)</p> Signup and view all the answers

What are two common uses of eddy currents?

<p>Generating heat in induction furnaces (D)</p> Signup and view all the answers

What is the phenomenon called when a changing current in one coil induces an emf in a neighboring coil?

<p>Electromagnetic induction (C)</p> Signup and view all the answers

Define wattless current.

<p>Current without consuming electrical power (D)</p> Signup and view all the answers

Why can the voltage drop across an inductor or capacitor in a series LCR circuit be greater than the applied voltage?

<p>Because of phase difference (A)</p> Signup and view all the answers

What is one way to reduce iron loss in a transformer?

<p>Using a laminated iron core (D)</p> Signup and view all the answers

Why are electromagnetic waves considered transverse in nature?

<p>Sinusoidal variations of electric and magnetic field vectors at right angles to propagation (B)</p> Signup and view all the answers

How are electromagnetic waves produced?

<p>By accelerated or oscillating charges (D)</p> Signup and view all the answers

Flashcards

Equipotential Surface

A surface where every point has the same electric potential.

Electric Field on Equipotential Surface

The electric field is always normal (perpendicular) to the surface.

Condition for Total Internal Reflection

Light must travel from a denser medium to a rarer medium, and the angle of incidence must be greater than the critical angle.

Why Electric Field Lines Don't Cross

If they crossed, the electric field would have two directions at one point, which is impossible.

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Normality of Electrostatic Field Lines on a Conductor

Tangential components would cause electrons to move along the surface, contradicting electrostatics.

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Uses of Eddy Currents

Generating heat in induction furnaces and electric brakes.

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Electromagnetic Induction

The phenomenon where a changing current in one coil induces an electromotive force (EMF) in a neighboring coil.

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Wattless Current

Current that does not contribute to the real power consumption in an AC circuit.

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Voltage Drop in a Series LCR Circuit

Due to resonance conditions, the voltage across individual components can be a multiple of the applied voltage.

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Reduce Iron Loss in Transformer

Using a laminated iron core which reduces eddy current losses.

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Transverse Nature of EM Waves

The electric and magnetic field vectors oscillate perpendicular to each other and to the direction of propagation.

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Production of Electromagnetic Waves

By accelerating or oscillating electric charges.

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