If the currents in these wires have the same magnitude, but opposite direction,

Question

If the currents in these wires have the same magnitude, but opposite direction, what is the direction of the magnetic field at point P? (a) direction (b) direction 2 (c) direction 3 (d) direction 4 Three particles travel through a region of space of space where the magnetic field is out of the page as, shown in the figure. What are the signs of the charges of these three particles? (a) 1 is neutral, 2 is negative, and 3 is positive. (b) 1 is neutral, 2 is positive, and 3 is negative. (c) 1 is positive, 2 is neutral, and 3 is negative. (d) 1 is negative, 2 is neutral, and 3 is positive. A wire lying in the plane of the page carries a current toward the bottom of the page, as shown in the figure. What is the direction of the magnetic force it produces on an electron that is moving to the left directly toward the wire, as shown? a) straight into the page b) straight out of the page c) directly toward the top of the page d) directly toward the bottom of the page

Explanation / Answer

28)

Direction of Magnetic field due to straight current carrying conductor is given by right hand rule:

hold wire in your right hand such that, thumb points towards the current, curling fingers give the direction of magnetoc field.

So, if P is equidistant from both wires, magnetic field will be of same magnitude, and in direction 2 and 4,Therefore cancelling each other.

29)

Lorentz force on a moving particle having charge is

q(V x B)

V is velocity vector, B is magnetic field applied.

If q=0, no force.

So 2nd is neutral.

If a charge is negative, consider its velocity in opposite direction, and positive charge.

So, first is positive.

C IS CORRECT.

30)

Rule for magnetic field is given is 28 question.

So, due to this wire,B is perpendicular to page, outwards(above).

And lorentz force on this particle moving towards wire will be, Downwards.

A IS CORRECT.

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.