If a conductor wire is heated, its resistance decreases and conductivity increases.
It is a chemical change because the baking soda and vinegar are reacting to form a new product.
Answer:
Option B
Explanation:
Looking at the 3 galvanometer readings given above, for galvanometer A, the reading is -2 mA.
For galvanometer B, the reading is 4 mA.
While for galvanometer C, the reading is -5 MA
Thus, option B is correct.
