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When the switch is open, the potential difference across the terminals of a battery is 20 0.0V. When a current of 2.0A flows, the potential difference across the battery drop to 16V. If this battery consists of two identical cells in series, what is the electromotive force of each cell? 8.0V 10.0V 16.0V 20.0V

T A 2.0 x 102-km-long high-voltage transmission line 2.0 cm in diameter carries a steady current of 1.0 x 10° A. If the conductor is copper with a free charge density of 8.5 × 1028 electrons/m³, how many years does it take one electron to travel the full length of the cable?

The circuit in the figure consists of switch S, a 5.10 V ideal battery, a 20.0 MQ resistor, and an airfilled capacitor. The capacitor has parallel circular plates of radius 4.90 cm, separated by 5.00 mm. At time t = 0, switch S is closed to begin charging the capacitor. The electric field between the plates is uniform. At t = 150 µs, what is the magnitude of the magnetic field within the capacitor, at radial distance 2.40 cm? Number i S C R Units T

Resistance R (Ω)   Current I (A) 10   4 20   2 30   1.33 40   1 50   0.82 60   0.67 Plot a graph of I 1/R.

A positive charge moves near a very long wire carrying a current as shown. If the 3.1 C charge moves at 9×105 m/s and is 11 cm away from the 7 A current in the long wire, what is the magnitude of the force on the charge? (in N)(a) 1.26(b) 3.55×101(c) 1.95×107(d) 1.12×102

A caterpillar of length 6.00 cm crawls in the direction of electron drift along a 8.20-mm-diameter bare copper wire that carries a uniform current of 38.0 A. (a) What is the potential difference between the two ends of the caterpillar? (b) Is its tail positive or negative relative to its head? (c) How much time does the caterpillar take to crawl 2.30 cm if it crawls at the drift speed of the electrons in the wire? (The number of charge carriers per unit volume is 8.49 × 1028 m-3 and resistivity of copper is 1.69 × 10-8 Ω·m.)