If external torque acting on the system along x− axis add up to zero, then
A
Angular momentum of system along x− axis is always zero.
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B
Angular momentum of system along y− axis remains constant.
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C
Angular momentum of system along z− axis remains constant
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D
Angular momentum of system along x− axis remain constant.
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Solution
The correct option is D Angular momentum of system along x− axis remain constant. As external torque is zero along x− axis is zero. ∴ Angular momentum of system along x-axis remain constant (may or may not be zero)
So, option (d) is correct.