A conducting gas is in the form of a long cylinder. Current flows thro

1.	A conducting gas is in the form of a long cylinder. Current flows through the gas along the length of the cylinder. The current is distributed uniformly across the cross-section of the gas. Disregard thermal and electrostatic forces among the gas molecules. Due to the magnetic fields set up inside the gas and the forces which they exert on the moving ions, the gas will tend to (a) expand (b) contract (c) expand and contract alternately (d) none of the above
Answer» Correct Answer is: (b) contract Treat the gas as a thick conductor carrying a uniform current. Apply Ampere’s law to find the magnetic field. Then apply the left-hand rule to find the direction of the Ampere force.

A conducting gas is in the form of a long cylinder. Current flows through the gas along the length of the cylinder. The current is distributed uniformly across the cross-section of the gas. Disregard thermal and electrostatic forces among the gas molecules. Due to the magnetic fields set up inside the gas and the forces which they exert on the moving ions, the gas will tend to (a) expand (b) contract (c) expand and contract alternately (d) none of the above

Answer»

Correct Answer is: (b) contract

Treat the gas as a thick conductor carrying a uniform current. Apply Ampere’s law to find the magnetic field. Then apply the left-hand rule to find the direction of the Ampere force.

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