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પ્રવાહ વિદ્યુત

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ભૌતિક વિજ્ઞાન ધોરણ 12 સેમિસ્ટર 3

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ભૌતિક વિજ્ઞાન

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

પ્રવાહ વિદ્યુત

કેટલા ઈલેક્ટ્રોન 1 A નો પ્રવાહ રચે છે ?

$bold 6 bold. bold 25 bold space bold cross times bold space bold 10 to the power of bold 9$
$bold 6 bold. bold 25 bold space bold cross times bold space bold 10 to the power of bold 18$
$bold 6 bold. bold 25 bold space bold cross times bold space bold 10 to the power of bold 5$
$bold 6 bold. bold 25 bold space bold cross times bold space bold 10 to the power of bold 6$

300 K તાપમાને

bold 1 bold space bold capital omega

અવરોધ ધરાવતા પદાર્થનો અવરોધ કયા તાપમાને

bold 2 bold space bold capital omega

થશે ? અવરોધકતા તાપમાન ગુણાંક

bold 0 bold. bold 00125 bold space open parentheses bold degree bold C close parentheses to the power of bold minus bold 1 end exponent

છે.

1400 K
1154 K
1127 K
600 K

r ત્રિજ્યા ધરાવતા તારનો અવરોધ R છે. જો આ તારમાંથી 2r ત્રિજ્યાવાળો નવો તાર બનાવવામાં આવે તો નવો અવરોધ .................. થશે.

$bold R over bold 2$
$bold R over bold 16$
2R
4R

bold R over bold 16

Tips: -

bold R bold space bold equals bold space bold ρl over bold A bold space bold equals bold space bold ρlA over bold A to the power of bold 2 bold space bold equals bold space bold ρV over bold A to the power of bold 2 bold space bold equals bold space fraction numerator bold ρV over denominator bold pi to the power of bold 2 bold space bold r to the power of bold 4 end fraction bold R bold space bold proportional to bold space bold 1 over bold r to the power of bold 4 bold therefore bold space bold space bold R subscript bold 2 over bold R subscript bold 1 bold space bold equals bold space open parentheses bold r subscript bold 1 over bold r subscript bold 2 close parentheses to the power of bold 4 bold R subscript bold 2 over bold R bold space bold equals bold space open parentheses fraction numerator bold r over denominator bold 2 bold r end fraction close parentheses to the power of bold 4 bold space bold equals bold space bold 1 over bold 16 bold therefore bold space bold R subscript bold 2 bold space bold equals bold space bold R over bold 16

વાહકનો વિશિષ્ટ અવરોધ .................. પર આધારિત છે.

લંબાઈ
આડછેદના ક્ષેત્રફળ
દળ
ઉપરમાંથી એકપણ નહિ.

$bold 10 bold space bold capital omega$ અવરોધ ધરાવતા તારને સમાન રીતે ખેંચીને તેની લંબાઈમાં 10% નો વધારો કરવામાં આવે તો નવા તારનો અવરોધ કેટલો થાય ?

$bold 1 bold. bold 1 bold space bold capital omega$
$bold 11 bold. bold 1 bold space bold capital omega$
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$bold 13 bold. bold 1 bold space bold capital omega$

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