This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.
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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)/( c) Step 3: Substitute the value of the critical angle and calculate. n = (1)/((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. 3 done, 2 left today. You're making progress.