Choose the best description of a magnetic field line.
o
a. a magnetic field line shows the direction a positive charge would
move.
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b. magnetic field lines for a bar magnet are parallel to the magnet.
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c. magnetic field lines always point north.
o
d. a magnetic field line shows the direction a compass needle would
point.
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Acrow drops a 0.11kg clam onto a rocky beach from a height of 9.8m. what is the kinetic energy of the clam when it is 5.0m above the ground? what is its speed at that point?

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?

In a good thermo flask the main cause of heat loss is