Question

a current of 20A flows through a wire when a battery which is able to do work of 20 j per coulomb is connected to it. calculate the resistance of the conductor

Answer 1

Given

● Current flowing = 20 A

● Work done = 20 J/C

To find

● Resistance of conductor

Solution

Here, current (I) = 20A

Work done (W) = 20 J per Coulomb.

Using formula :

⋆ Work done = Potential difference × Charge

⇒ W = V × q

⇒ V = W/q ....(i)

∴ W/q = 20 Joules.

Again using formula :

⇒ Current (I) = Voltage/Resistance

⇒ Voltage = Current (I) × Resistant (R)

⇒ V = IR ....(ii)

From (i) and (ii) we get :

⇒ W/q = IR

⇒ 20 = IR

⇒ 20 = 20R

⇒ R = 20/20

⇒ R = 1Ω

∴ Resistance in conductor = 1Ω

Answer 2

Explanation:

Sodium hydroxide is also known as caustic soda. It is very much soluble in water. It readily absorbs water from the air. Whenever they are left open in air they absorb water and sticks to each other. It is a strong base and undergoes complete neutralization in the presence of strong acid forming salt and water. It is used in pH regulation, to synthesise the sodium salt, in making soaps and detergents.