How many turns should a 10-cm long ideal solenoid have if it is to generate a 1.5-mT magnetic field when 1.0 A of current runs through it? (?0 = 4? × 10-7 T ? m/
A)
A) 12
B) 15
C) 120
D) 1200
E) 3200
C
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Four unequal resistors are connected in a parallel circuit. Which one of the following statements is correct about this circuit?
A) The total resistance is less than the smallest resistor. B) The total resistance is equal to average of the four resistors. C) The total resistance is more than the largest resistor. D) The total resistance is equal to zero. E) None of the other answers is correct.
The operation of a microwave oven makes use of
A) the polar nature of water molecules. B) flip flopping of polarized molecules. C) an oscillating electric field. D) all of the above E) none of the above
A sensitive ammeter is connected to a wire loop and placed within the magnetic field of a strong horseshoe magnet. The ammeter shows a deflection when:
a. the wire is moved parallel to the field. b. the wire is moved perpendicularly to the field. c. neither wire nor magnet is moving. d. the wire's axis is parallel to the field.
All the following may be represented by vectors except
a. velocity. b. acceleration. c. speed. d. displacement.