1 ) In an LR circuit , time constant is that time , in which current grows from zero to the value ( where I˳ is the steady state current ) ?

1 ) In an LR circuit , time constant is that time , in which current grows from zero to the value ( where I˳ is the steady state current ) ?

Solution : -

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2 ) At what distance should a book be placed from a 50 cd ( Candela ) bulb , so that the illuminance on the book becomes  2 (Lm/m2) .

Solution : -

Illuminance (E) is measured in Lux . The lux is SI unit used when characterizing illumination condition of a surface .

 

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3 ) A particle executes SHM of amplitude A ,

a ) At what distance from the execute position is its kinetic energy equal to half its potential energy ?

b ) At what position from the execute position is its speed half the maximum speed ?

Solution : -

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4 ) A bar magnetic of magnetic moment is aligned parallel to the direction of a uniform magnetic field B . Calculate work done to align the magnetic moment : -

a ) opposite to the field ,

b ) normal to the field ,

Solution : -

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