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Question:

Pick out the two scalar quantities in the following list: force, angular momentum, work, current, linear momentum, electric field, average velocity, magnetic moment, and relative velocity.

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Last updated date: 21st Jun 2024
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Answer
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Hint: Scalar quantities are quantities that have only magnitude (no direction). Look for terms in the list that do not have direction associated with them.


Step-by-Step Solution:

Force: Force is a vector quantity because it has both magnitude and direction. It is not a scalar.


Angular Momentum: Angular momentum is a vector quantity because it depends on both the magnitude and direction of an object's angular velocity and moment of inertia. It is not a scalar.


Work: Work is a scalar quantity. It represents the energy transferred to or from an object due to a force acting on it. It has magnitude but no direction associated with it.


Current: Current is a scalar quantity. It represents the flow of electric charge and is measured in amperes. It has magnitude but no direction.


Linear Momentum: Linear momentum is a vector quantity. It is the product of an object's mass and velocity. It has both magnitude and direction.


Electric Field: Electric field is a vector quantity. It represents the force experienced by a charged particle in an electric field and has both magnitude and direction.


Average Velocity: Average velocity is a vector quantity. It is the displacement of an object divided by the time taken, and it has both magnitude and direction.


Magnetic Moment: Magnetic moment is a vector quantity. It describes the strength and orientation of a magnetic source and has both magnitude and direction.


Relative Velocity: Relative velocity is a vector quantity. It describes the velocity of one object as observed from another and has both magnitude and direction.


Answer:
The two scalar quantities in the list are "Work" and "Current."


Note: Scalar quantities are important in physics as they represent quantities with magnitude only, without the need to specify a direction. In contrast, vector quantities have both magnitude and direction and are often represented as arrows in diagrams and equations. It's crucial to understand the distinction between scalar and vector quantities when working with physical quantities and equations in physics.

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