(6%) Problem 1: Please answer the following questions about magnetic fields. ▷ A 33% Part (a) Which of the following statements about magnetic fields are true? There are no magnetic field lines outside the magnet. Magnetic field lines point outward from the north pole of a magnet. There are no magnetic field lines unless iron filings are present. Magnetic field lines point outward from the south pole of a magnet. None of these. Magnetic field lines point in towards the north pole of a magnet. Submit Hint I give up! Feedback: 0% deduction per feedback. Feedback Hints: 0% deduction per hint. Hints remaining: 3 A 33% Part (b) What is an acceptable ending to the following sentence: "Magnetic field lines..." 33% Part (c) Which of the following arrangements produces an attractive force? ab2phy ab2ph (8%) Problem 2: A wire of length L=0.35 m and mass m = 0.055 kg carries a current of I=0.45 A. The wire is floating at rest in a magnetic field as shown in the figure. Randomized Variables L=0.35 m m = 0.055 kg 1=0.45 A -25% Part (a) What are the forces acting on the wire, and which directions do they go? Magnetic force, downward. Gravity, downward. Gravity, downward. Magnetic force, upward. Magnetic force, upward. Gravity, upward. Gravity, upward. Magnetic force, downward. Hints: 0% deduction per hint. Hints remaining: 1 Submit Hint Feedback I give up! Feedback: 0% deduction per feedback. B X X X X X X X I X X X X X 25% Part (b) Express the magnitude of the magnetic force in terms of the current I, length L and the magnetic field B. 25% Part (c) Given the fact that the wire is floating at rest, derive an expression for B. 25% Part (d) Calculate the numerical value of B in tesla. X X X X X X X X X X X X X X X X Otheexpertta.com Grade Summary Deductions Potential 100% Submissions Attempts remaining: (33% per attempt) detailed view vate (11%) Problem 3: Consider the magnetic fields and currents depicted in the figure. 17% Part (a) What is the direction of the magnetic force on the current in (a)? no force into the page left right up down Hints: 0% deduction per hint. Hints remaining: 2 Submit Hint Feedback I give up! Feedback: 0% deduction per feedback. 17% Part (b) What is the direction of the magnetic force on the current in (b)? A 17% Part (c) What is the direction of the magnetic force on the current in (c)? & 17% Part (d) What is the direction of the magnetic force on the current in (d)? A 17% Part (e) What is the direction of the magnetic force on the current in (e)? 17% Part (f) What is the direction of the magnetic force on the current in (f)? copo Ctheexpertta.com Grade Summary Deductions Potential 0% 100% Submissions Attempts remaining: 5 (20% per attempt) detailed view (6%) Problem 4: Consider the magnetic forces (F) and currents (I) depicted in the figure. Do not consider any forces except those due to a magnetic field. Hints: 0% deduction per hint. Hints remaining: 3 Submit Hint F Feedback I give up! Feedback: 0% deduction per feedback. (a) Fin I 33% Part (a) What is the direction of the magnetic field that produces the magnetic force shown on the currents in figure (a), assuming B is perpendicular to I? up Grade Summary right into the page left out of the page down Deductions Potential (b) I (c) Otheexpertta.com 0% 100% Submissions Attempts remaining: 5 (20% per attempt) detailed view 33% Part (b) What is the direction of the magnetic field that produces the magnetic force shown on the currents in figure (b), assuming B is perpendicular to I? 33% Part (c) What is the direction of the magnetic field that produces the magnetic force shown on the currents in figure (c), assuming B is perpendicular to I? (4%) Problem 5: Consider a lightning bolt at the equator that carries 17500 A. Randomized Variables I=17500 A 50% Part (a) What is the magnitude of the magnetic force per meter (N/m) on the lightning bolt if it is perpendicular to the Earth's 3.00 x 105 T field? FIL= Grade Summary Deductions Potential sin() cotan() atan() cosh() cos() asin() acotan() tanh() ODegrees Submit tan() acos() sinh() cotanh() Radians Hint π E ( 14 7 Feedback 1 85 17 + 0 VO BACKSPACE 2 9 6 3 . HOME END CLEAR 0% 100% Submissions Attempts remaining: 5 (5% per attempt) detailed view I give up! Hints: 0% deduction per hint. Hints remaining: 2 Feedback: 0% deduction per feedback. 50% Part (b) What is the direction of the force if the current is straight up (out of the page) and the Earth's field direction is due north, parallel to the ground?