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Answer six questions from this part: Question 1 and any other five. Question 1 carries 5 marks while others carry 3 marks each.

Physics

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Answer

c

5\text{5}

Step-by-step solution

3 steps

Part a

Two materials required for the construction of a d.c. generator are

  • Copper (for windings, armature coil, and commutator segments)
  • Soft iron or steel (for the core of the armature and field magnets)

Part b

The distinction between flat plate and focusing collectors is

  • Flat plate collectors absorb solar radiation over a large, flat surface and collect both direct and diffuse sunlight, typically achieving lower temperatures.
  • Focusing collectors use mirrors or lenses to concentrate direct sunlight onto a smaller absorber area, achieving much higher temperatures.

Part c

5\text{5}

To calculate the magnification of the eyepiece, we use the formula for the total magnification of a compound microscope.

  1. State the given values.

    The magnification produced by the objective lens, Mo=4M_o = 4.
    The total magnifying power of the microscope, M=20M = 20.

  2. Use the formula for total magnification.

    The total magnification of a compound microscope is the product of the magnification of the objective lens and the magnification of the eyepiece (MeM_e).

    M=Mo×MeM = M_o \times M_e

  3. Substitute the given values and solve for MeM_e.

    20=4×Me20 = 4 \times M_e Me=204M_e = \frac{20}{4} Me=5M_e = 5

    The magnification of the eyepiece is 5\boxed{\text{5}}.

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