A current reading is obtained by properly placing an ammeter in a circuit consisting of one resistor and one battery. As a result
A) the voltage drop across the resistor increases.
B) the current flowing in the circuit increases.
C) the current flowing in the circuit decreases.
D) the current flowing in the circuit does not change.
C
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A charged particle (m = 5.0 g, q = ?70 ?C) moves horizontally at a constant speed of 30 km/s in a region where the free fall gravitational acceleration is 9.8 m/s2 downward, the electric field is 700 N/C upward, and the magnetic field is perpendicular to the velocity of the particle. What is the magnitude of the magnetic field in this region?
a. 47 mT b. zero c. 23 mT d. 35 mT e. 12 mT
Four 2.0-µC point are at the corners of a rectangle with sides of length 3.0 cm and 4.0 cm. What is the electric potential (relative to infinity) at the midpoint of the rectangle? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 1.3 MV B) 2.9 MV C) 3.5 MV D) 7.8 MV
Near the surface of the planet, the Earth's magnetic field is about 0.50 × 10^-4 T. How much energy is stored in 1.0 m3 of the atmosphere because of this field?
Conversion of Units: Given that 1.00 in. = 2.54 cm and 1.00 yd = 36.0 in., how many meters are in 7.00 yd?
A. 6.40 m B. 36.3 m C. 640 m D. 1.78 × 103 m