Final answer:
It is true that an electrician should apply constant pressure when bending pipes to avoid kinks, and false that voltage is the same at every point in a circuit diagram's wire. It is true that tension describes a pulling force, that a falling magnet induces current in a copper tube, and false that an inventor can levitate by charging himself and his ceiling oppositely. so, option a is the correct answer.
Step-by-step explanation:
Understanding Electric Circuits, Magnetic Fields, and Electrical Safety
Regarding the bending of pipes in electrical work, it is true that an electrician should apply constant foot pressure to the bender to avoid creating "kinks" or warps in the bend. This ensures a smooth bend for the conduit. In a circuit diagram, the statement that the voltage is the same at every point in a given wire is false. Voltage drop occurs across components in a circuit, not across wires that are assumed to be ideal conductors with no resistance. The definition of tension is indeed true; it is the pulling force transmitted axially by the means of a string, rope, cable or similar one-dimensional continuous object, or by each end of a rod, truss member, or similar three-dimensional object.
It is true that dropping a bar magnet through a copper tube will induce an electric current—this is due to electromagnetic induction. The magnetic field lines from a positive point charge do indeed radiate outward, making the statement true. It is true that credit cards with magnetic strips should not be placed near permanent magnets as it can demagnetize the strips and render them unusable.
When a straight length of flexible copper wire is in a magnetic field and the current runs in the +x-direction, it will experience a force that bends it perpendicularly to both the current and magnetic field directions, according to the right-hand rule. If the current direction is reversed, the wire will bend in the opposite direction. For the eccentric inventor's scenario, it is false; placing a negative charge on himself would attract positively charged items, not cause his clothes to fly off due to a positive charge being applied to the ceiling.