# Category: 5.MAGNETIC FORCES AND TORQUES

# Category: 5.MAGNETIC FORCES AND TORQUES

#### If the electric field strength of a radio broadcast signal at a TV receiver is given by E = 5.0 cos (t – y) az, V/m, determine the displacement current density. If the same field exists in a medium whose conductivity is given by 2.0 x 103 (mho)/cm, find the conduction current density.

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#### Suppose that the loop of Example 6-1 is replaced with a 10-turn square loop centered at the origin and having 20 cm sides oriented parallel to the x and y axes. If B = ˆzB0 x^2 cos 103 t and B0 = 100 T, find the current in the circuit.

Suppose that the loop of Example 6-1 is replaced with a 10-turn square loop centered at the origin and having ...

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#### Questions 1 – 3: The op-amp in Figure 1 is ideal. Determine va, vout, and iout. 1.) Calculate the value of va and place your answer in the box. 2.) Calculate the value of vout and place your answer in the box. 3.) Calculate the value of iout and place your answer in the box. 4.) Find the equivalent capacitance across terminals a and b of the circuit shown in Figure 2 and place answer in box. Questions 5 and 6: Determine the current iL(t) and energy stored in the induction shown in Figure 3 attimet=2seconds.Letvs(t)=0fort<0andvs(t)=(6t +6)Vfort≥0.Theinductorisnot magnetized for t < 0. 5.) Find the inductor current at t = 2 seconds and place answer in box.

Questions 1 – 3: The op-amp in Figure 1 is ideal. Determine va, vout, and iout. 1.) Calculate the value ...

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#### What is a magnetic dipole? Describe its magnetic field distribution.

What is a magnetic dipole? Describe its magnetic field distribution ...

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#### Two infinitely long parallel wires carry currents of equal magnitude. What is the resultant magnetic field due to the two wires at a point midway between the wires, compared with the magnetic field due to one of them alone, if the currents are (a) in the same direction and (b) in opposite directions?

Two infinitely long parallel wires carry currents of equal magnitude. What is the resultant magnetic field due to the two ...

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#### Exercise 5-5: A square coil of 100 turns and 0.5 m long sides is in a region with a uniform magnetic flux density of 0.2 T. If the maximum magnetic torque exerted on the coil is 4×10 −2 ( N·m), what is the current flowing in the coil?

Exercise 5-5: A square coil of 100 turns and 0.5 m long sides is in a region with a uniform ...

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#### Exercise 5-4: A horizontal wire with a mass per unit length of 0.2 kg/m carries a current of 4 A in the +x direction. If the wire is placed in a uniform magnetic flux density B, what should the direction and minimum magnitude of B be in order to magnetically lift the wire vertically upward? [Hint: The acceleration due to gravity is g = −ˆz 9.8 m/s2 . ] Answer: B = ˆy0.49 T.

Exercise 5-4: A horizontal wire with a mass per unit length of 0.2 kg/m carries a current of 4 A ...

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#### Concept Question 5-2: The ends of a 10 cm long wire carrying a constant current I are anchored at two points on the x axis, namely x = 0 and x = 6 cm. If thewire lies in the x–y plane in a magnetic field B = ˆyB0 , which of the following arrangements produces a greater magnetic force on the wire: (a) wire is V-shaped with corners at (0, 0), (3, 4), and (6, 0), (b) wire is an open rectangle with corners at (0, 0), (0, 2), (6, 2), and (6, 0).

Concept Question 5-2: The ends of a 10 cm long wire carrying a constant current I are anchored at two ...

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