Physics: Aclosely wound rectangular coil of 75.0 turns has dimensions of 22.0 cm by 45.0 cm . the plane of the coil is rotated from a position where it makes an angle of 36.0 ° with a magnetic field of 1.00 t to a position perpendicular to the field. the rotation takes 6.00×10^−2 s .

Aclosely wound rectangular coil of 75.0 turns has

kenzie19169

02.01.2022

51.52 V

Explanation:

Given

N=75 turns

$Area=22\times 45 cm^2$

$\theta =36^{\circ}$

$Emf induced =-N\frac{\mathrm{d}\phi }{\mathrm{d} t}$

$Emf=-75A\frac{B_2-B_1}{t}$

$Emf=-75\times 22\times 45\times 10^{-4}\frac{1(1-cos(90-36))}{6\times 10^{-2}}$

Emf=51.52 V

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janae789

24.02.2020

42KVA

Explanation:

Given data

High Voltage (HV)= 480V

Low Voltage (LV)= 277V

Fo find

Size of transformer=?

Solution

To find the size of transformer here we use the co-ratio.The Co-ratio is given as:

Co-Ratio= (HV - LV)/HV

where

HV is High Voltage

LV is Low Voltage

Now put the values we get

Co- Ratio=(480-277)/480=.42

So the size of transformer is 42KVA

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