A horizontal metal bar rotates at a constant angular velocity w about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The emf induced between the two ends of the bar is
A) constant and proportional to the product B ?.
B) constant and proportional to the product B ?2.
C) constant and proportional to the product B2 ?2.
D) variable with a maximum of B ?.
E) variable with a maximum of B ?2.
A
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A current of 4.0 A is maintained in a single circular loop having a circumference of 80 cm. An external magnetic field of 2.0 T is directed so that the angle between the field and the plane of the loop is 20°. Determine the magnitude of the torque exerted on the loop by the magnetic forces acting upon it
a. 0.41 N / m b. 0.14 N / m c. 0.38 N / m d. 0.27 N / m e. 0.77 N / m
Davisson and Germer used a nickel crystal for their scattering experiments that had been modified when they tried to repair it. Which of the following describes the major change from before they tried to repair it and afterward that allowed them to work on the groundbreaking experiments they did?
What is the approximate volume of the average adult human body?
A. 0.05
B. 0.1
C. 0.5
D. 1
In going from Sa to Sc, the size of the ________ reduces significantly
Fill in the blank(s) with correct word