How does rubbing a glass rod with wool charge the rod? What happens when a positively charged rod is brought…

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How does rubbing a glass rod with wool charge the rod? What happens when a positively charged rod is brought near a negatively charged object?

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7. State two ways in which the electromagnet could be made to lift a heavier steel ball. To make an electromagnet stronger: Increase the number of turns in the coil. Increase the current flowing through the coil. 8. Determine the refractive index of the glass Step 1: Identify the critical angle from the diagram. The diagram shows that the critical angle c for the glass-air interface is 48.19°. Step 2: Use the formula for refractive index in terms of the critical angle. The refractive index n of a material is related to its critical angle c with respect to air by the formula: n = (1)/(sin c) Step 3: Substitute the value of the critical angle and calculate. n = (1)/(sin(48.19°)); n = 1/0.7455 n ≈ 1.3414 The refractive index of the glass is approximately 1.34. 9. The figure shows a negatively charged object suspended using a thread. A glass rod was rubbed using a woolen cloth and then brought closer to the object. Step 1: Determine the charge of the glass rod. When a glass rod is rubbed with a woolen cloth, the glass rod loses electrons and becomes positively charged. Step 2: Identify the charge of the suspended object. The suspended object is stated to be negatively charged. Step 3: Describe the interaction between the two objects. Opposite charges attract each other. Therefore, the positively charged glass rod will attract the negatively charged suspended object. Step 4: State the observable effect. The negatively charged light sphere will be attracted towards the glass rod, causing it to swing closer to the rod.

How does rubbing a glass rod with wool charge the rod? What happens when a positively charged rod is brought near a negatively charged object?

Step-by-step solution

Identify the critical angle from the diagram.

Use the formula for refractive index in terms of the critical angle.

Substitute the value of the critical angle and calculate.

Determine the charge of the glass rod.

Identify the charge of the suspended object.

Describe the interaction between the two objects.

State the observable effect.

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