If a state official wished to challenge the constitutionality of a federal law, which amendment would she or he most likely cite?

Explanation:

Tenth Amendment was part of the bill  of rights. It states that the powers which are not specifically delegated to the federal government by the constitution belongs to the people and state. Its purpose is to define the division of power between state and Federal government.  It was used to define the federal taxing power, federal regulations and police power.  It got added to the Constitution due to the determination of Anti- Federalists.

So if the state official wants to challenge a federal law, he would cite the tenth amendment because it specifies the state and federal powers.

The line charge density is

Explanation:

Given that,

Diameter = 2.54 cm

Distance = 19.6 m

Potential difference = 115 kV

We need to calculate the line charge density

Using formula of potential difference

Where, r = radius

V = potential difference

Put the value into the formula

Hence, The line charge density is