17. Which of the following is true? A) A constant charge can induce a magnetic f

Question

17. Which of the following is true? A) A constant charge can induce a magnetic field around it B) A constant current can induce a magnetic field around it C) A constant magnetic field can induce a current in a static closed circuit D) A constant magnetic field can induce an electric field E) A constant electric field can induce a magnetic field 18. An infinite wire carries current i, flowing upwards and another infinite wire carries current i, flowing to the right, as shown. i 1.0 A and i, 2.0 A. Point P is at the same distance from the two wires. The magnetic field at P is A) out of the page B) into the page C) to the right D) to the left E) downward 19. Four currents are pointing in the same direction, perpendicular to the plane of an equilateral triangle. i:, are placed at the three vertices of the triangle, and 4 is at the center of the triangle. i.-i,-i. What should , be so that the net force on 4 is zero? A) 0 B)C D) v3 E)2 i 20. Three currents are perpendicular to the Ca page, as shown, 1.0 A, i,-1.5 A and i, = 2.0 A. Along the four closed paths, which one gives the largest value of path A) C B) C C) C, Ca C4 E) All paths give the same value.

Explanation / Answer

17. A constant current i can induce magnetic field around it.

Answer: B

18. due to i1 the field is pointing inside and due to i2 the field is pointing outside. since i2 is larger by twice of i1 the net field will point outside

Answer: A

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