A solenoid used to produce magnetic fields for research purposes is 1.6 m long, with an inner radius of 30 cm and 1200 turns of wire. When running, the solenoid produced a field of 1.2 T in the center. How large a current does this carry

1273.07  A

Explanation:

Using,

B = μI(N/L) Equation 1

Where B = Magnetic field, μ = permiability of thr core, I = current, N = Number of turns, L = Length.

Making I  the subject of the equation above,

I = BL/Nμ Equation 2

Given: B = 1.2 T, L = 1.6 m, N = 1200 turns

Constant: μ = 4π×10⁻⁷T.A/m

Substitute these values into equation 2

I = 1.2(1.6)/( 4π×10⁻⁷×1200)

I = 1.92×10⁷/(4π×1200)

I = 19200000/15081.6

I = 1273.07  A

Hence it carries a current of 1273.07  A

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.

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