A magnetic field of 37.2 T has been achieved at the MIT Francis Bitter National Magnetic Laboratory. A magnetic field of 37.2 T has been achieved at the MIT Francis Bitter National Magnetic Laboratory. Find the current needed to achieve such a field
(a) 2.00 cm from a long, straight wire;
(b) At the center of a circular coil of radius 42.0 cm that has 100 turns;
(c) Near the center of a solenoid with radius 2.40 cm, length 32.0 cm, and 40,000 turns.

e/c, where e is its total energy

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answer: the potential energy decreases from 379 j to 243 j

explanation:

for the law of conservation of energy, the total energy in a system must be conserved. the total energy of the system is given by the sum of kinetic (k) and potential (u) energy:

e = k + u

the total energy is e=675 j, and this does not change.

initially, the kinetic energy is k=296 j, so the potential energy is

at the end, the kinetic energy is k=432 j, so the potential energy is

so, we see that the potential energy has decreased from 379 j to 243 j.

125 m

explanation: