1 : 6
1 : 3
2 : 1
6 : 1
Correct answer is D
\(\frac{V_1}{V_2}\) = \(\frac{I_1R_1}{I_2R_2}\)
\(\frac{I_1}{I_2}\)V2 = 3V1 and R1 = 2R2
\(\frac{V_1}{3V_1}\) = \(\frac{I_1 \times\ 2R_2}{I_2\times R_2}\)
\(\frac{I_1}{I_2}\) = \(\frac{6}{1}\)
At different locations on the earth's surface, the earth's magnetic field is
the same in magnitude and direction
the same in magnitude but different in direction
different in both magnitude and direction
different in magnitude but different in direction
Correct answer is A
No explanation has been provided for this answer.
4.8 Vm-1
75.0Vm-1
4800.0Vm-1
75000.0Vm-1
Correct answer is D
E = \(\frac{voltage}{distance}\)
= \(\frac{600}{8 \times 10^2}\)
= 75000.0Vm-1
Which of the following pairs of colours gives the widest separation in the spectrum of white light?
Red and Violet
Green and Yellow
Red and Indigo
Yellow and Violet
Correct answer is A
No explanation has been provided for this answer.
convex and u =2f
concave and u = 2f
convex and u = f
concave and u = f
Correct answer is B
-The image formed by a concave lens is always virtual, erect and magnified.
-The image formed by a concave mirror can be real or virtual, enlarged or diminished, and erect or inverted, depending upon the distance of the object from the mirror