Question : A wire-carrying current is
Option 1: positively charged
Option 2: negatively charged
Option 3: neutral
Option 4: charged with a type depending upon the current strength
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Correct Answer: neutral
Solution : The correct option is neutral.
Free electrons moving in a certain direction cause the current in a wire. However, the number of protons and electrons in the wire at any given time is equal, and the charge on an electron is equal to and the opposite of that of a proton. Therefore, there is no net charge on the wire.
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Question : A current carrying conductor is associated with:
Option 1: a magnetic field
Option 2: an electric field
Option 3: an electromagnetic field
Option 4: an electrostatic field
Question : Which of the following is a warm current?
Option 1: Labrador Current
Option 2: Falkland current
Option 3: Canary Current
Option 4: Gulf stream
Question : The fuse in an electric circuit is connected in _______.
Option 1: series with neutral
Option 2: parallel
Option 3: parallel to neutral
Option 4: series
Question : A solid metallic sphere of radius 9 cm is melted and recasted into a wire of radius 2 cm. What is the length of the wire?
Option 1: 343 cm
Option 2: 152 cm
Option 3: 243 cm
Option 4: 184 cm
Question : The speeds of a boat along the current and against the current are 10 km/hr and 8 km/hr, respectively. What is the speed (in km/hr) of the current?
Option 1: 1
Option 2: 2
Option 3: 3
Option 4: 9
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