A +20-nC point charge is placed on the x axis at x = 2.0 m, and a ?25-nC point charge is placed on the y axis at y = ?3.0 m. What is the direction of the electric field at the origin?
a. 209°
b. 61°
c. 29°
d. 241°
e. 151°
a
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Suppose you are facing north and you see the Big Dipper close to your northern horizon, with Polaris (and the Little Dipper) above it. Where will you see the Big Dipper in six hours?
A) to the right of Polaris; that is, 90 degrees counterclockwise from its current position B) to the left of Polaris; that is, 90 degrees clockwise from its current position C) directly above Polaris D) still in the same place, below Polaris
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Suppose we suspend a negatively charged ball like a pendulum inside a hollow but completely enclosing metal box. Assume that the ball hangs a few inches from the box’s left vertical face. Imagine that we now bring a very strong positively charged object to a point just to the left of the box’s left face, so that it is only a few inches away from the suspended ball (though the box’s left face is between them). The ball will be deflected
A. strongly toward the external object. B. strongly away from the external object. C. weakly toward the external object. D. weakly away from the external object. E. not the least little bit.
The huge lobe radio galaxy at the center of the Virgo Supercluster is:
A) Virgo X-1. B) M-87, a giant elliptical galaxy. C) M-74, a very bright Seyfert Spiral. D) M-82, disturbed by the passage of M-81 nearby. E) the Large Magellanic Cloud, disturbed by Supernova 1987A.