An object has negative electric charge whenever A. it has an excess of electrons

Question

An object has negative electric charge whenever A. it has an excess of electrons B. it has a deficiency of electrons C. the nuclei of its atoms are positively charged D. the electrons of its atoms are positively charged Which of the following statements is correct? A. Electrons carry electric current B. The motion of electrons produces an electric current C. Moving electrons constitute an electric current D. Electric currents are carried by conductors and insulators only Electric energy is equal to A electric power times time B. resistance times current C. voltage times current D. residence times voltage All magnetic fields originate its A. iron B. permanent magnets C. stationary electric charges D moving electric changes A drawing of the field lines of magnetic field provides information on A. the direction of the field only B. the strength of the field only C. both the direction and the strength of the field D the source of the field A moving electric charge produces A. only an electric field B. only a magnetic field C. both an electric and a magnetic field D. any of these, depending on its speed The magnetic field lines around a long, straight current are A. straight lines parallel to the current B straight lines that radiate from the current like spokes of a wheel C. concentric circles around the current D. concentric helixes around the current

Explanation / Answer

17)

B. it has a deficiency of electrons.

18)

C. Moving electrons constitute electric currents.

19)

A. electric power x time

20)

D) moving electric charges

21)

C. both the direction and the strength of the field.

22)

C. both a electric field and magnetic field.

23)

C. concentric circles around the current.

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