Question

A 2c of charge is moving from a point at potential 120V to a point at potential 55V find the engery supplied by the charge​

Answer 1

Answer:

• Energy supplied by Charge = 130 Joules.

Explanation:

Given,

• Amount of charge being carried, Q = 2 C
• Charge is moving from a point of potential 120 V to a point of potential 55 V

To find,

• Energy supplied by the Charge = ?

Solution,

→Potential difference between the two points, V = 120 V - 55 V

→ V = 65 V

therefore,

• the potential difference between the two points is 65 Volts.

Now, Using formula

→ V = W / Q

[ Where V is potential difference, W is work done by charge Q ]

→ 65 = W / 2

→ W = 65 × 2

→ W = 130 J

It means, work done by charge is equal to 130 Joules.

and since, Energy is equivalent to work done therefore,

• The energy supplied by the Charge is 130 Joules.

Answer 2

Given:

• Q= Charge = 2C
• V1= 120V
• V2= 55V

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Need to Find:

• Energy supplied by the charge=?

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Solution :

V'= Magnitude of change in Potential difference

⟹V'= |V2-V1|

⟹V'=|55-120|

⟹V'= 65 Volt

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Now we know,

$Potential \: Difference \: = \dfrac{Work \: Done}{Charge}$

$\implies \: 65 = \dfrac{Work \: Done}{2}$

$\implies \: Work \: Done = 130J$

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Work is a form of energy. Work is closely related to energy. The work-energy principle states that change in the kinetic energy of a rigid body is caused by an equal amount of work done on the body by the resultant force acting on that body.

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Thus Work done = Energy Supplied

• $\red{\therefore\:Energy\:Supplied=130J}$