2011 - JAMB Physics Past Questions and Answers - page 5

Under neutral equilibrium, the body rolls and the position of the center of gravity , C. G is neither raised nor lowered

Electric potential is work done in taking a unit mass or charge from infinity to that point

m = ^v/_u = -3

v = -3u

f = 15cm
¹/_v + ¹/_U = ¹/_f
¹/_-3U + ¹/_u = ¹/₁₅
²/_3u = ¹/₁₅

3U = 15 x 2

U = ³⁰/₃

= 10 cm

f₁ = 255Hz, T₁ = 225N

f₂ = ? T₂ = 324N

But f ∝ √T => f = K√T

=> K = ^f/_√T

∴ ^f₁/_√T1 = ^f₂/_√T2
²²⁵/_√225 = ^f₂/_√324

= 306Hz

= 1A

Correct Answer: Option E

        Rate of diffusion is inversely proportional to the square root of density - Graham's law<br />

( P \propto \frac{1}{v} ) at constant temperature - Boyle's law

( P \propto T ) at constant volume - Pressure law

( P \propto T ) at constant pressure - Charles law

therefore no correct option

if appliances are connected in series, the effective voltage is the sum of individual voltages which will be high.

Irms = ( \frac{I_0}{\sqrt{2}} )

( \text{Therefore } \sqrt{2Irms} = I_0 \

\frac{Irms}{I_0} = \frac{1}{\sqrt{2}} )

Correct Answer: Option E