Question

In the winter season, you can hear a crackling sound and see sparks while pulling off woollen clothes because of -
1. Electrostatic force
2. Magnetic force
3. Gravitational force
4. Muscular force

Answer 1

Correct Answer - Option 1 : Electrostatic force

The correct option is Electrostatic Force. 

Concept:

Electrostatic Force

• The Electrostatic force is the force that acts between two charged particles. 
• An object gets positively charged by losing electrons and gets negatively charged by gaining electrons. 
• These charges exert forces on each other. The force is attractive if charges are negative and repulsive when charges are positive.
• An object getting charge can induce a charge in other objects and apply electrostatic force on it. 

Charging by rubbing 

• Two objects may get charged when they are rubbed against each other. 
• If we comb hair, the comb gets charged and so does hair.
• This can be observed by bringing small papers near charge.
• This static charge can be acquired by electrical insulators such as wool.

Explanation:

• When we pull off the sweater, the woollen cloth gets rubbed by our bodies. 
• Due to this rubbing transfer of electrons takes place. 
• This transfer of charge process causes a crackling sound and sparks are observed. 

• Magnetic force: The force by which a magnet attracts iron or other magnetic materials is called magnetic force. An electric current-carrying conductor also applies magnetic force at its nearby.
• Gravitational force: The force acting between two masses by virtue of mass is the gravitational force. Anything falls on earth by the gravitational force of the Earth. 
• Muscular force: The force which we apply by our muscles is called muscular force.