Part A The magnitude of the magnetic field at a certain distance from a long, st

Question

Part A

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by B. What is the magnitude of the magnetic field at twice the distance from the conductor?

Part B

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

Part C Two long parallel wires are placed side by side on a horizontal table. The wires carry equal currents in the same direction. Which of the following statements are true? Check all that apply.

A. At twice the distance, the magnitude of the field is 4B. B. At twice the distance, the magnitude of the field is 2B. C. At twice the distance, the magnitude of the field is B/2. D. At twice the distance, the magnitude of the field is B/4. E. At twice the distance, the magnitude of the field remains equal to B.

Explanation / Answer

A) B = u0 I / (2 pi d )

when d' = 2d so B' = B/2 .

hence twicce the distance, magnitude of field is B/2.

Ans(C)

B) crossing (curling ) fingers of right hand while keeping thumb in the direction of current.

so direction of fingers will give the direction of field.

Ans. E north

C) Field at midpoint will be zero.
and when direction of current is same so force will be attarctive.

ANs(B & C)

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