phys10chap12.1

if we apply a voltage across a steel wire and then heat it, we see that the current passing through it _______

• increases

• decreases

• stays the same

• disappears

R = Ro(1 + 𝘢△T)

what is 𝘢 in the given formula?

draw a thermometer

what is superconductivity ???

• it is an activity to find if a conductor is super

• it is when resistance of conductor drops to zero

• it is a tool to measure electricity

• it is when resistance of copper is 100

Materials whose resistance varies with temperature. such as (a)   , are used to construct resistance thermometers.

1. Where superconductors are used????

Aluminum wire at 0°C has resistance of 4.25 Ohm. What is resistance of

wire at 200°C?

when the BCS Theory was discovered?

• 1934

• 1941

• 1957

• 1959

When a superconducting material is placed in a magnetic field, it repels all _________ coming from outside

• magnetic flux

• atoms

• electrons

• resistance