Two 2.0Ω resistors can be combined circuit to give an overall resistance of
0.5Ω only
1.0 Ω only
either 0,5Ω or 1.0 Ω
either 1.0Ω or 4.0 Ω
either 0.5Ω, 1.0Ω or 4.0Ω
Correct answer is D
No explanation has been provided for this answer.
Calculate the peak voltage of a mains supply of r.ms. value 220V.
121 V
156 V
225 V
240 V
311 V
Correct answer is E
No explanation has been provided for this answer.
0.5
1
1.5
2
3
Correct answer is B
Using the lens formula,
1v+1u=1f
Where u, v and f are the object distance, image distance and focal length respectively.
∴
\frac{1}{u} = \frac{1}{2f} - \frac{1}{f} \implies \frac{1}{u} = \frac{1}{2f}
u = 2f
\therefore Magnification = \frac{\text{image distance}}{\text{object distance}}
= \frac{2f}{2f}
= 1