MCQ
What is immaterial for an electric fuse wire
- AIts specific resistance
- BIts radius
- ✓Its length
- DCurrent flowing through it
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$(a)$ The distance between the objective and eye piece is $20.02\; m$
$(b)$ The magnification of the telescope is $1000$
$(c)$ The image of the planet is erect and diminished
$(d)$ The aperture of eye piece is smaller than that of objective
The correct statements are :

Where $h =$ Planck's constant, $m =$ mass of electron and $c =$ speed of light.
($A$) $\mathrm{E}=0, \mathrm{~B}=0$
($B$) $\mathrm{E}=0, \mathrm{~B} \neq 0$
($C$) $\mathrm{E} \neq 0, \mathrm{~B}=0$
($D$) $\mathrm{E} \neq 0, \mathrm{~B} \neq 0$
Choose the most appropriate answer from the options given below :