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

a)
Connect the positive terminal of a battery and float the other end of the battery

b)
Rub it with a piece of fur

c)
Bring a positively charged rod near the sphere and touch it to ground for a short while

d)
Rub it with a piece of silk

Correct answer is option 'C'. Can you explain this answer?

Question

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

a)
Connect the positive terminal of a battery and float the other end of the battery
b)
Rub it with a piece of fur
c)
Bring a positively charged rod near the sphere and touch it to ground for a short while
d)
Rub it with a piece of silk

Correct answer is option 'C'. Can you explain this answer?

Answer

By induction when we bring the - ve charged rod near metal sphere the +ve charge of sphere attracted by rod and - ve charge repelled and by the ground earthing there will maximum positive charge in sphere

Answer

Method to charge a metal sphere positively without touching it:

Option C is the correct answer.

Explanation:

When a negatively charged rod is brought near the metal sphere, the electrons in the metal sphere will be attracted towards the rod. As a result, the electrons will move away from the metal sphere and accumulate on the side of the sphere that is farthest from the rod. This will leave the side of the sphere closest to the rod positively charged.

If the metal sphere is connected to the ground for a short while, the excess electrons will be neutralized and the positive charge will remain on the sphere. Thus, the metal sphere will be charged positively without touching it.

Option A is incorrect because connecting the positive terminal of a battery and floating the other end of the battery will not produce a positive charge on the metal sphere.

Option B and D are incorrect because rubbing the metal sphere with fur or silk will only produce a static charge, which may be positive or negative depending on the material used.

Answer

If we bring a negatively charged rod near a neutral sphere stood still on a non conducting holder, then positive charge will be induced near the rod area, and negative on other side. The other side with -ve charge can be earthed so that all the electrons go down and later after removing the rod , the left positive charge will spread . and the sphere will get positively charged. For more concern ncert page 7.

Answer

When we bring - ve charge near it, it develops charge inside it by induction
After it when we ground it all the electrons which are possessed it by induction flow to ground
And now the body will contain only - ve charge

Answer

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

Answer

C

Answer

D

Similar Class 12 Doubts

Which of the following methods can be used to charge a metal sphere positively without touching it? Choose the best possible option

A battery is of emf E is being charged from a charger such that positive terminal of the battery is connected to terminal A of charger and negative terminal of the battery is connected to terminal B of charger. The internal resistance of the battery is r.

The two plates X and Y of a parallel plate capacitor of capacitance C are given a charge of amount Q each. X is now joined to the positive terminal and Y to the negative terminal of a cell of emf E = Q/C.

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