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Standard VIII

Physics

Convention of Positive and Negative Charges

Five Styrofoa...

Question

Five Styrofoam balls A,B,C,D, and E are used in an experiment. The following observations were made in this experiment :
I. Ball A repels C and attracts B.
II. Ball D attracts B and has no effect on E.
III. a negatively charged rod attracts both A and E.
Based on the above information, answer the following questions:
The ball B must be

Positively charged

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Negatively charged

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Neutral

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Can't say

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Solution

The correct option is B
Negatively charged

The explanation for the correct answer:
B. Negatively charged
Ball D attracts B also ball A attracts B.
And A is attracted by the negative rod, so A is positive.
So, B is negatively charged.
Therefore, ball B must be option B negatively charged.

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(2) Which of the following has more inertia?

(a) A rubber ball and a stone of the same size.

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Five Styrofoam balls A,B,C,D and E are used in an experiment. The following observations were made in this experiment :

I.Ball A repels C and attracts B.

II. Ball D attracts B and has no effect on E.

III. a negatively charged road attracts both A and E.

Based on the above information, answer the following questions :

Ball A must be

Q. Five balls

A, B, C, D

and

E

are used in an experiment and following observations have been made :

(1)

Ball

A

repels

C

and attracts

B

(2)

Ball

D

attracts

B

and has no effect on

E

(3)

A negatively charged rod attracts both

A

and

E

.

Based on above information, select the correct charge configuration for balls (if any):

\begin{matrix} A & B & C & D & E (P) & + & - & + & 0 & + (Q) & + & - & + & + & 0 (R) & + & - & + & 0 & 0 (S) & - & - & - & 0 & 0 \end{matrix}

Describe a simple experiment using a pith ball electroscope to demonstrate that like charges repel and unlike charges attract each other.

Q. A negatively charged ebonite rod attracts a suspended ball of straw.Does it indicate that the ball is positively charged?Explain.

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The correct option is B Negatively charged The explanation for the correct answer:B. Negatively chargedBall D attracts B also ball A attracts B.And A is attracted by the negative rod, so A is positive.So, B is negatively charged.Therefore, ball B must be option B negatively charged.

The correct option is B
Negatively charged

The explanation for the correct answer:
B. Negatively charged
Ball D attracts B also ball A attracts B.
And A is attracted by the negative rod, so A is positive.
So, B is negatively charged.
Therefore, ball B must be option B negatively charged.