Home AC CIRCUIT ATOMS ELECTROSTATICS ERROR NEET 2020 PHOTON & ELECTRON Previous year Questions PROJECTILE MOTION A charged particle having drift velocity of 7.5× 10^-4 m/s in an electric field of 3×10^-10V/m, has mobility in m^2 V^-1 s^-1

A charged particle having drift velocity of 7.5× 10^-4 m/s in an electric field of 3×10^-10V/m, has mobility in m^2 V^-1 s^-1

July 27, 2021 Add Comment AC CIRCUIT , ATOMS , ELECTROSTATICS , ERROR , NEET 2020 , PHOTON & ELECTRON , Previous year Questions , PROJECTILE MOTION Edit

[NEET-2020 ]

a. 2.25×10^15 b. 25×10^6

c. 2.5×19^-6 d. 2.25 ×10^-15

We know that,

$Drift velocity = mobility * electric \; field$

$\therefore mobility =\frac{drift \; velocity}{electric\; field}$

$\therefore mobility =\frac{V_d}{E}$

$\therefore mobility =\frac{7.5 * 10^{-4}}{3*10^{-10}}$

$\therefore mobility =\frac{7.5 * 10^{-4-10}}{3}$

$\therefore mobility =\frac{7.5}{3} *10^{6}$

$\therefore mobility =2.5 *10^{6} \;m^2 V^{-1}s^{-1}$

The correct answer is option 'b'

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A charged particle having drift velocity of 7.5× 10^-4 m/s in an electric field of 3×10^-10V/m, has mobility in m^2 V^-1 s^-1

Milan Tomic

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In a potentiometer circuit, a cell of EMF 1.5 V gives a balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then at what length of the wire, does the balance point occur?

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A charged particle having drift velocity of 7.5× 10^-4 m/s in an electric field of 3×10^-10V/m, has mobility in m^2 V^-1 s^-1

Milan Tomic

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In a potentiometer circuit, a cell of EMF 1.5 V gives a balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then at what length of the wire, does the balance point occur?