Superconducting metal in super conducting state has relative permeability of

When a material is in superconducting state and a magnetic field is applied

A

The superconducting property is not affected

B

The superconducting property may be affected and resistivity may increase from zero to a low value

C

The superconducting property may be destroyed

D

The material may become an insulator

The elements which become superconducting at extremely low temperatures are

A

Good conductors at room temperature

B

Ferromagnetic at room temperature

C

Relatively poor conductors at room temperature

D

Insulators at room temperature

Substances which have permeability less than the permeability of free space are known as

A

Ferromagnetic

B

Paramagnetic

C

Diamagnetic

D

Bipolar

A Fast food shop sells pizza in 3 sizes: large, super, and jumbo. One day the shop sold 240 pizzas, and the ratio of sales of large to super to jumbo was 8 : 17 : 15. How many jumbo pizzas were sold that day?

A

48

B

90

C

102

D

108

Relative permeability of vacuum is

A

1

B

1 H/m

C

$$4\pi \times {10^{ - 7}}$$

D

$$\frac{1}{4}$$

The relative permeability of a ferromagnetic material is

A

Less than one

B

More than one

C

More than 10

D

More than 100 or 1000

The relative permeability of materials is not constant.

A

diamagnetic

B

paramagnetic

C

ferromagnetic

D

insulating

Paramagnetic materials have relative permeability

A

slightly less than unity

B

equal to unity

C

slightly more than unity

D

equal to that ferromagnetic mate rials

The relative permeability is less than unity is case of

A

ferromagnetic materials

B

ferrites

C

non-ferrous materials

D

diamagnetic materials

The unit of relative permeability is

A

henry/metre

B

henry

C

henry/sq. m

D

it is dimensionless

Superconducting metal in super conducting state has relative permeability of

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