Answer:
B = 4.5 x 10⁻⁷ T = 0.45 μT
Explanation:
From Ampere's law the magnetic field at a certain radius from straight current-carrying wire is given by the following formula:
where,
B = magnetic field = ?
= permeability of free space = 4π x 10⁻⁷ H/m
I = current = 180 A
r = radius = 80 m
Therefore,
<u>B = 4.5 x 10⁻⁷ T = 0.45 μT</u>
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Top to bottom: C, B, D, A.
Answer;
Activation energy
Explanation;
Activation energy is the least possible amount of energy (minimum) which is required to start a reaction or the amount of energy available in a chemical system for a reaction to take place.
Catalysts can lower the activation energy and increase the reaction rate without being consumed in the reaction. The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering activation energy.