Answers

2016-04-30T19:35:23+05:30
It has gained positive charge which means it has lost electrons we know electron has mass so it has lost its mass also
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But the +ve charge may also have some mass included with it
yes, you are right but protons do not take part in giving charge.only electrons do it.therefore if a body has gained a positive charge it means it has lost electron. the number of protons are same.hope It helped you.
2016-05-02T15:06:55+05:30
The mass of an isolated conducting sphere decreases due to the loss of electrons. Because the sphere is positive, so it should have lost electrons.
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there might be some mass associated with the +ve charge given that expell out the -ve charge