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# Give the Magnitude and Direction Of B At a Point 2.5 M East of the Wire. - CBSE (Science) Class 12 - Physics

#### Question

A long straight wire in the horizontal plane carries a current of 50 A in north to south direction. Give the magnitude and direction of at a point 2.5 m east of the wire.

#### Solution

Current in the wire, I = 50 A

A point is 2.5 m away from the East of the wire.

∴  Magnitude of the distance of the point from the wire, r = 2.5 m.

Magnitude of the magnetic field at that point is given by the relation, B=(mu_0 2I)/(4pir)

Where,

mu_0 = Permeability of free space = 4π × 10–7 T m A–1

B=(4pixx10^-7xx2xx50)/(4pixx2.5)

=4xx10^-6 T

The point is located normal to the wire length at a distance of 2.5 m. The direction of the current in the wire is vertically downward. Hence, according to the Maxwell’s right hand thumb rule, the direction of the magnetic field at the given point is vertically upward.

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#### APPEARS IN

NCERT Solution for Physics Textbook for Class 12 (2018 to Current)
Chapter 4: Moving Charges and Magnetism
Q: 3 | Page no. 169

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Solution Give the Magnitude and Direction Of B At a Point 2.5 M East of the Wire. Concept: Magnetic Force.
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