WAEC 2024/2025 Physics Obj & Theory Answers

Physics Objectives

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(1)

¥= force/length

Recall, mass= kg= M, length=m = L; time=s= T

So,

Force= mass × acceleration

= mass × velocity/time

= mass × displacement/time × 1/time

= mass × displacement/(time)²

= kg × m/s²

= kgm/s²

Dimension= ML/T²

Length= m

Dimension= L

Thus,

¥= (ML/T²) ÷ L

= ML/T² × 1/L

= ML/LT²

= M/T²

(1b)

gravimeter.

(2)

(3)

(4)

(5)

(i)They are used to make permanent magnets, which are essential in motors, generators, and various electronic devices.

(ii)Ferromagnetic materials are also used in magnetic storage media, including hard drives and magnetic tape, due to their ability to maintain a magnetic state without an external field.

(iii)They are utilized in transformers and inductors, which are critical components in power supplies and electrical circuits, where they enhance the magnetic coupling between coils.

(8)