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1752 Views

What is the effect of temperature on resistivity in different materials?

anirudha vats 2nd Jun, 2021

Hey,

For metals

The resistivity of a material is directly proportional to the temperature. With increase in temperature the free electrons in the material begins to move frequently  that leads to increase in collision within the material. The increased collision increases the resistivity of the material.

For semiconductor

With increase

186 Views

What are the charge carriers that are responsible for the flow of current in different materials?

Palak kumari 2nd Jun, 2021

Hi there,

The responsible charge carriers are:

1)solid:

a) conductor- free electrons are the responsibile charge carriers for flow of current.

b) semiconductor- free electrons + holes are the responsibile charge carriers for flow of current.

c) insulator- no charge carriers is responsible for the flow of current as these

2012 Views

What is ohmic and non-ohmic conductor?

Palak kumari 2nd Jun, 2021

Hey there,

Ohmic conductors are the conductor that obeys ohm's law.A mettalic conductor with small current is its example .

Non-ohmic conductors are the conductor which do not obey ohm's law.

A mettalic conductor with large amount of current, a pn-junction diode are its example.

Hope it helps!

54 Views

is st xaviers admission still open?

anirudha vats 2nd Jun, 2021

Hey,

St. Xavier College of Mumbai has not yet started it's admission process. The online application form will be available from 14th July, 2021  5 pm onwards which is mentioned on their website.

Below I have given the link of the website in case you want to have a look.

60 Views

can you provide me the link to apply to st xaviers for ug admission?

anirudha vats 2nd Jun, 2021

Hey,

St Xavier's College is one of the great autonomous colleges in India with A+ NAAC credit. The college offers different courses to students for their undergraduate as well as post graduate degree.

The application for the Undergraduate admission will begin from 14th July, 5PM onwards.

Below I have given

101 Views

actually, my graduation is not finish, its my last semester but the jnu from will released july, so can I apply for the pg entrance exam in this year and at the form fill up time they want the graduation certificate

Aditi Yadav 12th Jul, 2021
Hey Rimi!

Yes ,you can fill JNU Entrance Exam Application form this year.

As you have mentioned this is your last semester,so you can fill graduation certificate details later.

Actually because of Covid-19 situation, Universities and Colleges are conducting exams quite late but as you are final year student you
179 Views

Is non-attending better for 11th and 12th?

Palak kumari 2nd Jun, 2021

Hey aspirant,


See, these decisions are totally upto you. As i have been a regular student so i'll share my experience with you.Basically if we see then there are many advantages of regular schooling. These are as follows:-


1) you get the chance to clear your doubts in any topic

46 Views

What is conductivity and its s.i unit and with what it is denoted.

Palak kumari 2nd Jun, 2021

Hi there,

Conductivity of the conductor is the reciprocal of its resistivity . It's denoted by sigma. It's S.I unit is siemens/meter.

Conductivity = 1/resistivity.

Hope this information satisfies you!

96 Views

What is conductance and what is its s.i unit?

Palak kumari 2nd Jun, 2021

Hi there,

Hope you're doing well,

Conductance of the conductor is the ease with which electric charge flows through it. It is the reciprocal of resistance. It is denoted by G  . It's s.i unit is mho.

Conductance (G)= 1/R .

Here R is resistance.

Hope it helps!

63 Views

What is current density and state the formula of current density.

Palak kumari 2nd Jun, 2021

Hi there,

The current density inside the conductor at any point can be defined as amount of charges flowing per second through a unit area held normal to the direction of charges through it.

J=I/A

Where I is current and A is the area of conductor

Hope it helps!

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