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Magnet

Where do the ...

Question

Where do the manufactures use a magnetic strip in the refrigerator? Why is this magnetic strip used?

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Solution

Magnetic strips are used in refrigerator doors.

In the absence of magnet strip, the door will not close completely. This will allow warm air from outside to enter into the refrigerator. Further, the cool air from the refrigerator will also escape.

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Q. In a thin rectangular metallic strip a constant current

I

flows along the positive

x

-direction, as shown in the figure. The length, width and thickness of the strip are

l

w

d

, respectively. A uniform magnetic field

\to B

is applied on the strip along the positive

y

-direction. Due to this, the charge carriers experience a net deflection along the

z

-direction. This results in accumulation of charge carriers on the surface PQRS and appearance of equal and opposite charges on the face opposite to PQRS. A potential difference along the

z

-direction is thus developed. Charge accumulation continues until the magnetic force is balanced by the electric force. The current is assumed to be uniformly distributed on the cross section of the strip and carried by electrons.

Consider two different metallic strips (1 and 2) of same dimensions (length

l

w

d

) with carrier densities

n_{1}

n_{2}

, respectively. Strip 1 is placed in magnetic field

B_{1}

and strip~2 is placed in magnetic field

B_{2}

, both along positive

y

-directions. Then

V_{1}

V_{2}

are the potential differences developed between

K

M

in strips 1 and 2, respectively. Assuming that the current

I

is the same for both the strips, the correct options(s) is(are),

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