Charging by Induction

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Questions and Answers

Which of the following is a key difference between charging by induction and charging by conduction?

  • Charging by induction results in a permanent charge, while charging by conduction results in a temporary charge.
  • Charging by conduction requires direct physical contact, while charging by induction does not. (correct)
  • Charging by induction requires direct physical contact, while charging by conduction does not.
  • Charging by conduction is effective only with insulators, whereas charging by induction works only with conductors.

What is the role of electrons in the process of charging an electroscope by induction?

  • Electrons move within the electroscope to induce a charge separation. (correct)
  • Electrons are added to the electroscope to create a net positive charge.
  • Electrons remain stationary, allowing protons to move and create a charge.
  • Electrons are removed from the electroscope to maintain its neutrality.

In the context of charging by induction, what does it mean to 'induce' a charge?

  • To neutralize all charges within an object, making it electrically inert.
  • To cause a separation of charge within an object without direct contact. (correct)
  • To create a flow of electrons between two objects in contact.
  • To transfer a net positive charge onto a neutral object.

A negatively charged balloon is brought near a neutral wall. What happens to the charges in the wall during this process?

<p>Negative charges in the wall are repelled, and positive charges are attracted. (A)</p> Signup and view all the answers

Why is the attraction between a charged balloon and a neutral wall considered a temporary effect?

<p>Because the charge distribution in the wall returns to normal once the balloon is removed. (D)</p> Signup and view all the answers

What must be done to make an induced charge permanent on a neutral sphere?

<p>The sphere must be grounded while in the presence of the charged object, and the ground must be removed before the charged object. (D)</p> Signup and view all the answers

In the process of permanently charging a sphere by induction using a negatively charged rod, what charge will the sphere ultimately have?

<p>The sphere will have a positive charge. (C)</p> Signup and view all the answers

Why is grounding an essential step in permanently charging an object by induction?

<p>Grounding provides a path for charges to either leave or enter the object. (C)</p> Signup and view all the answers

A metal sphere is charged by induction using a positively charged rod. What is the correct sequence of steps?

<p>Bring the rod near, ground the sphere, remove the ground, remove the rod. (D)</p> Signup and view all the answers

Which process correctly describes the movement of electrons when a positively charged rod is used to charge a neutral metal sphere by induction?

<p>Electrons flow from the ground to the sphere, giving it a negative charge. (A)</p> Signup and view all the answers

What is the primary reason that charging by induction does not involve direct physical contact?

<p>To allow the electric field to influence charge distribution at a distance. (A)</p> Signup and view all the answers

If a neutral electroscope is charged by induction using a positive rod, what will be the final charge on the electroscope's leaves?

<p>The leaves will be negatively charged. (C)</p> Signup and view all the answers

Suppose you charge a metal sphere by induction using a negatively charged rod. When you bring the rod close but before grounding, what is the charge distribution on the sphere?

<p>Positive charges accumulate on the side nearer the rod, and negative charges on the far side. (A)</p> Signup and view all the answers

What happens if the grounding wire is removed after the charged rod is removed from the vicinity of the metal sphere?

<p>The sphere will become neutral again. (B)</p> Signup and view all the answers

A student brings a positively charged ebonite rod close to, but not touching, a neutral copper sphere. What happens to the electron distribution within the copper sphere?

<p>Electrons migrate toward the area closest to the ebonite rod. (B)</p> Signup and view all the answers

During the process of charging by induction to produce a permanent charge, why is it important to disconnect the ground connection before removing the charged object?

<p>To prevent the accumulated charge from flowing back once the influence of the charged object is removed. (C)</p> Signup and view all the answers

Which material property is most crucial for an object to be effectively charged by induction?

<p>High electrical conductivity. (C)</p> Signup and view all the answers

A neutral metal sphere is grounded, and then a positively charged rod is brought nearby but does not touch it. What happens to the overall charge of the sphere after the ground connection is briefly removed?

<p>The sphere gains a net negative charge. (A)</p> Signup and view all the answers

A metallic sphere is temporarily charged by induction using a positively charged rod. After the rod is removed, what occurs?

<p>The induced charge redistributes, and the sphere becomes neutral once again. (D)</p> Signup and view all the answers

What is the key difference between temporary and permanent induction?

<p>Permanent induction involves grounding, while temporary induction does not. (D)</p> Signup and view all the answers

Flashcards

Charging by Induction

Charging an object without direct contact. It involves the movement of electrons within a neutral object due to the presence of a nearby charged object.

Temporary Induction

Charging by induction can be temporary if the objects aren't grounded. The charge distribution reverts when the charged object is removed.

Permanent Induction

Charging by induction creates a lasting charge on an object, caused by grounding the object during induction, allowing electrons to permanently redistribute.

Electrons

Tiny particles with a negative charge that move within atoms and can be transferred between objects during charging.

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Induce

The act of causing or producing an electrical effect or charge, often through the movement or redistribution of electrons.

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Contact Charging

In charging, direct 'touch' is required for electron transfer.

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Study Notes

Induction

  • Induction is a method of charging objects without direct contact, unlike charging by friction or conduction, which both require contact.
  • Electrons in a neutral electroscope can move to induce a charge, causing the leaves of the electroscope to separate.

Charging by Induction: Temporary

  • A negatively charged balloon repels electrons in a neutral wall.
  • The balloon and wall experience attraction due to the charge separation in the wall

Charging by Induction: Permanent

  • A negative rod is brought near a neutral sphere causing attraction which polarizes the sphere into a positive side and negative side.
  • The opposite side of the object then gets grounded to the Earth, while the polarizing rod is held in place.
  • Electrons then transfer to the Earth.
  • The grounding wire is then removed.
  • Finally, the charged rod is removed creating a positively charged sphere.

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