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

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

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Physics
Circuit breaker usually operate under

Transient state of short-circuit current
Steady state of short-circuit current
After D. C. component has ceased
Sub-transient state of short-circuit current

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Physics
Scalar Quantities are

Physical quantities which have no magnitude and no direction
Physical quantities which have magnitude only and no direction
Physical quantities which have no magnitude only and only direction
Physical quantities which have magnitude only and direction

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