How does an electrophorus work to store electric charges?

JAMB Physics 2024 74 views

How does an electrophorus work to store electric charges?

  1. By using a metal disc to transfer charges through direct contact with a charged plate.
  2. By using a metal disc to transfer charges through electrostatic induction. ✓
  3. By using a plastic disc to accumulate charges through magnetic induction.
  4. By using a ceramic disc to transfer charges through thermal conduction.

Explanation

A function assigns exactly one output to each input. Written f(x) or y = expression. Domain is all possible input values; range is all possible outputs. f(3) means substitute x = 3.

Types: linear f(x) = mx + c (straight line), quadratic f(x) = ax² + bx + c (parabola), polynomial, rational, exponential f(x) = aˣ, logarithmic, trigonometric.

Composite functions: (f∘g)(x) = f(g(x)) – apply g first, then f to result. Inverse function f⁻¹: reverses f, so f⁻¹(f(x)) = x. Not all functions have inverses (must be one-to-one).

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