It has gained positive charge which means it has lost electrons we know electron has mass so it has lost its mass also
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.
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