Choose correct alternative.
If `R_1` and `R_2` are the filament resistances of a 100 watt bulb and 200 watt bulb designed to operate on the same voltage, then
A. `R_1 = 2 R_2`
B. `R_1 = 3 R_2`
C. `R_2 = 3 R_1`
D. `R_2 = 2 R_1`

Two resistance R1 and R2 connected in parallel, this equivalent resistance is.

Two Cars C_1 and C_2 are going round in concentric circles of radii R_1 and R_2 . They complete the circular paths in the same time Then (Speed of C_1)/(Speed of C_2) =

IF two circles of radii r_1 and r_2 (r_2gtr_1) touch internally , then the distance between their centres will be

Calculate : total resistance and R_1 = 3 Omega , R_2= 6 Omega , R_3 = 5Omega, V = 14 V.

The measurement of an unknown resistance R is to be carried out using Wheatstone's bridge. Two students perform an experiment in two ways. The first student R_2 = 10 Omega and R_1 = 5 Omega the other student takes R_2 = 1000 Omega and R_1 = 500 Omega . In the standard arm ,both take R_3 = 5 Omega . Both find R = [R_2/R_1] R_3 = 10 Omega within errors

R_1 and R_2 are the remainders when polynomials ax^3 +3x-3 and 2x^3 -5x +2a are divided by (x-4) . If 2R_1 -R_2 =0 , find the value of a.

Two charged sphere of radii R_1 and R_2 have equal surface charge density. The ratio of their potential is

If sin P=1/2 and /_P and /_R are complementary, then cos R=?

Two resistors have resistances R_1 = (37 +- 3) Omega and R_2 = (54 +- 5) Omega . Find the equivalent resistance of their series combination.

A projectile can have the same range R for two angles of projection. If t_1 and t_2 are the times of flight in the two cases, then the product of the two time of flight is proportional to A. R^2 B. frac(1)(R^2) C. frac(1)(R) D. R