Top answers

When the current through an ohmic conductor is 2A, the potential difference across it is 6V. What is the potential difference across the same ohmic conductor when the current is increased to 3A?

To answer this, you need to pick up on the clues in the question. "Ohmic conductor" is explicitly mentioned twice, so this is likely to be important. You should know that for ohmic conductors, p.d....
EG
3941 Views

Which of the following are magnetic materials? Copper, Cobalt, Carbon, Nickel

Cobalt and Nickel
EM
Answered by Elizabeth M. • Physics tutor
2387 Views

PHYSICS A LEVEL Explain why, when a red giant becomes a white dwarf, it moves towards the lower left of the Hertzsprung-Russell diagram [2]

The fusing red giant shell drifts away form the core forming planetary nebula. Leaving only very hot core (white dwarf) (1) The core is hotter than the shell , the star moves left on the diagram. (1) Luminos...
LC
Answered by Lavana C. • Physics tutor
2182 Views

1. At the end of a marathon sweat covered runners are given a shiny foil sheet to stop them cooling down too quickly. a) Suggest why the runner may cool down too quickly without the foil sheet (1) b.) Explain how the foil sheet reduces heat loss(2)

Note consider what type of heat loss is occurring1a) key word suggest Runner covered in sweat , when this evaporates it will reduce surface temperature (1)b) key word explain, remember this means it t not en...
LC
Answered by Lavana C. • Physics tutor
9663 Views

What is the evidence for the Big Bang theory?

Absorption spectra from distant galaxies consist of bands of coloured light crossed with black lines. The wavelengths of these black lines are shifted towards the red end of the spectrum when compared with l...
AM
Answered by Aled M. • Physics tutor
6164 Views