Advertisements
Advertisements
प्रश्न
When a glass rod is rubbed with a piece of silk cloth the rod ______.
विकल्प
and the cloth both acquire positive charge.
becomes positively charged while the cloth has a negative charge.
and the cloth both acquire negative charge.
becomes negatively charged while the cloth has a positive charge.
Advertisements
उत्तर
When a glass rod is rubbed with a piece of silk cloth the rod becomes positively charged while the cloth has a negative charge.
Explanation:
When an object is charged by rubbing it against another object, the two objects become oppositely charged. By convention, the charge that the glass rod acquired is positive and the charge that the cloth acquired is negative. Therefore, the rod becomes positively charged, and the cloth becomes negatively charged.
APPEARS IN
संबंधित प्रश्न
Friction depends on the ______ of surfaces.
Suppose your writing desk is tilted a little. A book kept on it starts sliding down. Show the direction of frictional force acting on it.
Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why?
Give examples to show that friction is both a friend and a foe.
A charged glass rod attracts a charged plastic straw.
What is the cause of friction?
The eraser gets smaller and smaller as you use it more and more. Explain the reason.
List three ways of reducing friction.
Answer the following in a word or two or in a sentence.
Which type of force acts on a string pulled from both ends?
Answer the following in a word or two or in a sentence.
Why does a rolling ball stop after moving some distance?
Fill in the blank.
Rolling friction offers ............. resistance than sliding friction.
Tick the most appropriate answer.
A car skids on a wet or muddy road due to
Tick the most appropriate answer.
Friction produces
Fill in the blank.
Smoother the surface, ................. is the frictional force offered by it.
Answer the following in a word or two or in a sentence.
Why is difficult for a pen to leave a mark on a highly smooth plastic sheet?
Answer the following in short.
Define rolling friction and give an example where rolling. friction comes into play.
Answer the following in detail.
Describe three different ways by which friction can be increased to help us in various situations?
Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play
In the following figure, a boy is shown pushing the box from right to left. The force of friction will act on the box
