Charging a balloon and rubbing it on wool is an example of static electricity.
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Answer:
mass.
Explanation:
other physical factors are changeable but the mass of a particular substance is always constant.
Answer:
Given, Apparent weight(W₂)=4.2N
Weight of liquid displaced (u)=2.5N
Let weight of body in air = W₁
Solution,
U=W₁-W₂
W₁=4.2=2.5=6.7N
∴Weight of body in air is 6.7N