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Concepts Of Physics MCQ Edition [Volume 2]

Exam: Concepts Of Physics MCQ Edition [Volume 2]
Subject: Physics
Chapter: Electric Current in Conductors

Concepts Of Physics MCQ Edition [Volume 2] · Physics · Electric Current in Conductors

A wire of length 2.0 m has a resistance of 5.0 . Determine the...

A wire of length

2.0 \text{ m}

has a resistance of

5.0 \Omega

. Determine the electric field present inside the wire when a current of

10 \text{ A}

flows through it.

Options

A $100 \text{ V/m}$
B $25 \text{ V/m}$
C $0.25 \text{ V/m}$
D $4.0 \text{ V/m}$

Correct answer

B. $25 \text{ V/m}$

Step-by-step solution

The potential difference

V

across the wire is given by Ohm's law:

V = IR

Substituting the given values:

V = 10 \times 5.0 = 50 \text{ V}

The electric field

E

inside a uniform wire of length

L

is given by:

E = \dfrac{V}{L}

Substituting the values of

V

and

L

:

E = \dfrac{50}{2.0} = 25 \text{ V/m}

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