1.

Two copper spheres A and B have equal radii. If sphere A has 100 electrons and sphere B has 400 protons then what will be the electric charge on each of them when they are brought in contact and separated ?

Answer»

`4.8 xx 10^(-17)` C
`2.4 xx 10^(-17)` C
`1.6 xx 10^(-17)`
`6.4 xx 10^(-17)` C

Solution :Total charge when they are in CONTACT,
`Q = n_(1)(-e) + n_(2)(e)`
`=-100e + 400e = 300e`
`=300 xx 1.6 xx 10^(-19) C = 4.8 xx 10^(-17) C`
Equal charge will be distributed when they are separated.
`THEREFORE` Total charge on each sphere `=(4.8 xx 10^(-17))/2`
`=2.4 xx 10^(-17)` C


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