Question

Differentiate between Downward displacement of air and upwad displacement of air​

Answer 1

Here your answer!

→upward displacement of air - collection of a gas/liquid below air (i.e. by displacing air upwards)

→downward displacement of water - collection of an immiscible liquid/gas above the surface of water (i.e. by displacing water downward)

→Collection of hydrogen is not possible by upward displacement of air because hydrogen-air mixture is combustible. It is only possible by downward dispacement of water because hydrogen does not dissolve in water

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Answer 2

Answer:

The direction of the magnetic force is normally outwards the plane in which the wire is placed.

Explanation:

Assuming, the direction of x, y and z axes directions as follows:

x-axis: Along the horizontal direction, positive towards east and negative towards west.

y-axis: Along the vertical direction, positive towards the upwards direction and negative towards downwards direction.

z-axis: Along the normal to the plane in which the wire is placed, positive along normally outwards direction and negative along normally inwards direction.

are the unit vectors along the x, y and z axes directions respectively.

Given:

Direction of current is upwards.

Direction of magnetic field is along east.

 

Let,

Current flowing in the wire =  

Length element of the wire,  

Magnetic field,  

Magnetic force on the wire =  

We know that the magnetic force on the wire is given by

Since, the force is along , i.e., along the positive z axis, the direction of the magnetic force is normally outwards the plane in which the wire is placed.

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