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Physics-

General

Easy

Question

The SI unit of gravitational potential is

J
${J k g}^{- 1}$
Jkg
${J k g}^{2}$

The correct answer is: $J k g to the power of negative 1 end exponent$

Gravitational potential $equals fraction numerator w o r k over denominator m a s s end fraction$
Hence, SI unit gravitational potential
$equals fraction numerator u n i t blank o f blank w o r k over denominator u n i t blank o f blank m a s s end fraction$
$equals fraction numerator J over denominator k g end fraction equals J k g to the power of negative 1 end exponent blank o r blank m s to the power of negative 2 end exponent$

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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

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

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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
Least count for length $equals 0.1 blank c m$
Least count for time $equals 0.1 blank s$

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Least count for time $equals 0.1 blank s$

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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