Problem 1: (5 points) A material of resistivity p is formed into a solid cylinde

Question

Problem 1: (5 points) A material of resistivity p is formed into a solid cylinder of height h and radius r. The resistance between two ends of the cylinder is R0. If the radius becomes r/2 while keeping the same height, the resistance becomes Problem 2: (5 points) For the network of resistors shown in the figure, find the equivalent resistance between A and B. Problem 3: (5 points) A rectangular coil of wire, 25.0 cm by 20.0 cm and carrying a current of 2.50 A, is oriented with the plane of its loop parallel to a uniform 1.50- T magnetic field. Find the magnitude of the torque the magnetic field exerts on the coil. Problem 4: (5 points) Four very long, parallel power lines each carry 100-A currents. A cross-sectional diagram of these lines is a square, 50.0 cm on each side. Which of the following cases shown below gives a non-zero magnetic field at the center of the square.

Explanation / Answer

Problem 1:

Ans: D,

Problem 2:

Ans: 29.8 ohm,

Problem 3:

Ans: zero since angel is zero ,

Problem 4:

Ans: B

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---