Question

The length of a potentiometer wire is 5m. An electron in this wire experiences a force pf 4.8 ×10-19 N emf of the main cell used in potentiometer is
1)3V
2) 15V
3) 1.5V
4) 5V​

Answer 1

Answer:

$f = qe \\ e = \frac{v}{l} \\ v = \frac{fl}{q } = \frac{4.8 \times 10 \ { }^{ - 19} \times 5}{1.6 \times 10 { }^{ - 19} } \: \: \: \: \: = 15v$

$hence \: option \: b \: is \: correct$

Answer 2

Answer:

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