In the wave mechanical theory, the maximum of the charge distribution in the ground state occurs for a distance from the nucleus equal to

A)
first Bohr radius
B)
second Bohr radius
C)
third Bohr radius
D)
either first or second Bohr radius

Correct Answer : Option (A) :   first Bohr radius

Explanation : The total charge associated with an electron moving about nucleus in the ground state of hydrogen atom is given by  4π²rp(r)dr.

This integrand has a maximum value at r = radius of first Bohr orbit.

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Magnetic hysteresis phenomenon is explained by
A)
domain rotation
B)
motion of domain walls
C)
motion of domain walls and domain rotation
D)
None of the above

Correct Answer :   motion of domain walls and domain rotation

A circular sphere mile is the area of cross-section of a wire
A)
having a radius equal to 1 miles
B)
having a circumference equal to 1 miles
C)
having a circumference equal to 0 miles
D)
having a diameter equal to 1 miles

Correct Answer :   having a diameter equal to 1 miles

For small size high frequency coils, the most common core material is
A)
steel
B)
ferrite
C)
air
D)
powdered iron

Correct Answer :   air

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