When 1.0-C point charge is 15 m from a second point charge, the force each one experiences a force of 1.0 N. What is the magnitude of the second charge? (k = 1/40 = 9.0 109 N m2/C2 )
A) 25 C B) 25 nC C) 0.025 C D) 1.0 C E) 10 nC
Question 2
A circular coil of radius 5.0 cm and resistance 0.20 is placed in a uniform magnetic field perpendicular to the plane of the coil. The magnitude of the field changes with time according to B = 0.50e-20t T.
What is the magnitude of the current induced in the coil at the time t = 2.0 s?
A) 4.2 mA B) 2.6 mA C) 7.5 mA D) 1.3 mA E) 9.2 mA
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