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Maharashtra State BoardSSC (English Medium) 7th Standard

Electric Charge

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Topics

  • Introduction
  • Experiment

Introduction

Electric charge is a property found in all objects, including our bodies. Everything around us is made of tiny particles that carry electric charge. There are two types of charges:

  • Positive charge (+)
  • Negative charge (-)

In most objects, positive and negative charges are equal, making the object neutral (no net charge). When charges are balanced, the electric charge remains hidden, and we don't notice it. If an object has more positive or more negative charges, it becomes charged. A charged object can attract or repel other charged objects, depending on the type of charge.

Experiment

1. Aim: To observe how objects with similar and opposite electric charges behave.

2. Requirements: Two glass rods, silk cloth, a plastic rod, woollen cloth, and thread for suspending the rod.

3. Procedure

  • Charging the glass rod: Rub one end of a glass rod with a silk cloth to charge it. Suspend the charged glass rod freely in the air using a thread.
  • Testing with another glass rod: Rub another glass rod with a silk cloth to charge it. Bring it close to the suspended glass rod.
    Observation: The two rods push each other away (repulsion).
  • Testing with a plastic rod: Rub one end of a plastic rod with a woollen cloth to charge it. Bring it near the suspended glass rod.
    Observation: The rods attract each other (attraction).

4. Conclusion: Similar charges repel each other (like in the case of the two glass rods). Opposite charges attract each other (like the plastic rod and the glass rod). Benjamin Franklin named these charges as positive (+) and negative (-).

Repulsion and attraction

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