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Physics-

General

Easy

Question

An electron in the ground state of hydrogen atom is revolving in anticlockwise direction in the circular orbit of radius R The atom is placed in a uniform magnetic induction B such that the plane normal of electron orbit makes an angle 30 $degree$ with B, as shown in figure. The torque experienced by electron will be

$\frac{e h B}{8 π m}$
$\frac{e h}{8 π B m}$
$\frac{e B}{8 π m h}$
$\frac{h B}{8 π e m}$

The correct answer is: $fraction numerator e h B over denominator 8 pi m end fraction$

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Which of the following is not a unit of energy

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A physical quantity $P blank$ is given by $P equals fraction numerator A to the power of 3 end exponent B to the power of fraction numerator 1 over denominator blank 2 end fraction end exponent over denominator C to the power of negative 4 end exponent D to the power of fraction numerator 3 over denominator 2 end fraction end exponent end fraction.$ The quantity which brings in the maximum percentage error in $P$ is

A physical quantity $P blank$ is given by $P equals fraction numerator A to the power of 3 end exponent B to the power of fraction numerator 1 over denominator blank 2 end fraction end exponent over denominator C to the power of negative 4 end exponent D to the power of fraction numerator 3 over denominator 2 end fraction end exponent end fraction.$ The quantity which brings in the maximum percentage error in $P$ is

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Kilowatt-hour is a unit of

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Students I, II and III perform an experiment for measuring the acceleration due to gravity $left parenthesis g right parenthesis$ using a simple pendulum. They use different lengths of the pendulum and/or record time for different number of oscillations. The observations are shown in the table
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If $E subscript I end subscript comma blank E subscript I I end subscript$ and $E subscript I I I end subscript$ are the percentage errors in $g comma blank i. e. comma blank open parentheses fraction numerator increment g over denominator g end fraction cross times 100 close parentheses$ for students I, II and III, respectively

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Least count for time $equals 0.1 blank s$

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The relationship between free energy and electrode potential is

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The cell reaction of the galvanic cell, Cu(s) / Cu²⁺(aq) // Hg²⁺(aq) / Hg(l) is

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