Physics
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Can be of any shape
Should be in the form of a vertical rod
Should be made of a good conductor like copper with sharp-pointed edges
Should be made of a good conductor but can be of any shape

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Physics
In the gamma decay of a nucleus

Neither the mass number nor the atomic number of the nucleus changes
The mass number of the nucleus does not change whereas its atomic number changes
Both the mass number and the atomic number of the nucleus change
The mass number of the nucleus changes whereas its atomic number does not change

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