Question

Two wires M and N carry the same current / but in opposite direction as shown below. The current in M wire travel out of the page and the current in N wire travel into the page. Which of the eight directions indicated by letters A through H represents the direction of the net magnetic field Bnet at point P? E P N м 0

Answer 1

Direction of magnetic field due to current carrying wire is given by right hand rule.

In this rule, if we direct our right hand thumb in the direction of current in wire then, by curling the fingers of right hand shows the direction of magnetic field.

From above rule,

(But B2) Simo B. ocho Box Coso

Given, both wires have same current 'I' and are equi-distance from 'P'.

So, |B1| = |B2| = B (Let)

also, B1*cos$\theta$ = B2*cos$\theta$

then, net magnetic field will be:

Bnet = (B1 + B2)*sin$\theta$ = 2*B*sin$\theta$ in upward direction

So, correct representation of the direction of net magnetic field at 'P' = G

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