Which of the following methods can be used to charge a metal sphere positively without touching it? Choose the best possible option:a)Connect the positive terminal a battery and float the other end of the batteryb)Rub it with a piece of furc)Bring a negatively charged rod near the sphere and touch it to ground for a short whiled)Rub it with a piece of silkCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

This can be possible by induction, if a negative charge rod is placed near the sphere (at a distance not in touch) then it attracts positive charge inside the sphere towards its side and the negative charges collected on the other side and when the surface of the sphere connected to the earth than the negative charge goes to earth and the sphere remain positively charged.

Since rubbing the metal ball with fur and a piece of silk cloth involves touching, they can not be the correct answer.

Therefore, the correct answer is C.

Answer

Charging a metal sphere positively without touching it

Method: Bring a negatively charged rod near the sphere and touch it to ground for a short while.

Explanation:

When a negatively charged rod is brought near a metal sphere, the electrons in the sphere are repelled and move to the far side of the sphere away from the rod. This leaves a net positive charge on the side of the sphere closest to the rod.

To charge the sphere positively, the excess electrons on the far side of the sphere need to be removed. This can be done by touching the far side of the sphere to the ground. The electrons will flow to the ground, leaving a net positive charge on the entire sphere.

This method is known as grounding or earthing. It effectively neutralizes any charge on an object by allowing any excess charges to flow to the ground.

Other methods listed in the question, such as rubbing the sphere with fur or silk, can charge the sphere but they will charge it negatively. Connecting the positive terminal of a battery and floating the other end will not work because the sphere is not in contact with the battery.

In summary, to charge a metal sphere positively without touching it, one can bring a negatively charged rod near the sphere and touch the far side of the sphere to the ground for a short while to remove any excess electrons.

Answer

On bringing a -ve charged rod, positive charges move towards it. and -ve charge move away to another side.
On earthing the -ve side of obj , we can remove -ve charges and get +vely charged obj

Answer

1.When a negative rod is brought near an uncharged metal sphere, the electrons in the sphere are pushed away from the side of the sphere closest the rod and move to the other side of the sphere, making the side close to the rod positive.

2.When rubbed with fur or silk, it shows that touching the metal sphere to produce charged sphere. And also the fur leaves the metal sphere negatively charged and silk leaves the sphere positively charged.

3.Connecting battery to positive terminal and floating the other end towards the sphere may develop a negatively charged sphere.

Hence by the process of induction, the metal sphere can be positively charged by bringing a negatively charged rod near the sphere. Correct option is C.

Similar Class 12 Doubts

Which of the following methods can be used to charge a metal sphere positively without touching it . Select the best

Charging a metal sphere by contact using a positively charged rod, followed by grounding can result in ________ charge in a metal sphere.

Can you explain the answer of this question below:Charging a metal sphere by contact using a positively charged rod, followed by grounding can result in ________ charge in a metal sphere.A:positiveB:ZeroC:positive or negative depending on which end is groundedD:negativeThe answer is b.

Charging a metal sphere by contact using a positively charged rod, followed by grounding can result in ________ charge in a metal sphere.

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