Question

A long, straight, vertical wire carries a current upward. Due east of this wire, in what direction does the magnetic field point? A long, straight, vertical wire carries a current upward. Due east of this wire, in what direction does the magnetic field point? west north upward east downward south

Answer 1

Answer:

The magnetic field points northwards

Explanation:

This is because a radial magnetic field is generated round the wire and its direction is always in the direction of the tangent to the circle at distance R from the wire. Due east of the wire, the tangent to the circle at radius, R points northwards. So, the direction of the magnetic field at that point is north.

Answer 2

The direction of magnetic field on the long vertical wire is due east.

Fleming’s left - hand rule states that if the thumb, middle finger and the index finger of the left hand are held perpendicular to each other;  

such that;

• the thumb points in the direction of  magnetic force (F)
• the middle finger points in the direction of the current (I)
• the Index finger points in the direction of the magnetic field (B)

the conductor placed in the magnetic field will experience Magnetic force.

From the given question;

• the current is pointing upwards (north)
• the magnetic field will point due east.

Thus, the direction of magnetic field on the long vertical wire is due east.

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