Click to Chat

1800-2000-838

+91-120-4616500

CART 0

• 0

MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: R

There are no items in this cart.
Continue Shopping
Get instant 20% OFF on Online Material.
coupon code: MOB20 | View Course list

• Electricity and Magnetism
• OFFERED PRICE: R 1,600
• View Details
Get extra R 320 off
USE CODE: CART20

```				   i often confused how to relate  between speed, torque, current, and voltage in a dc machine. for example when ew write the power equation P= 2(pi)NT/60 =VI.
from this eqation can I consider both N and T are directly related to current?
I know that the answer is NO. because N and T are always inversly related. but why?
can any one please cleare my confusion.
```

5 years ago

Share

```										Dear student,
Here is the basic principle for your understanding:
he force F on a wire of length L carrying a current i in a magnetic field     B is iLB times the sine of the angle between B and i, which would be 90° if     the field were uniformly vertical. The direction of F comes from the right     hand rule*, as shown here. The two forces shown here are equal and opposite,     but they are displaced vertically, so they exert a torque. (The forces on     the other two sides of the coil act along the same line and so exert no torque.)

* A number of different nmemonics are used to  remember the direction of the force. Some use the right hand, some the  left. For students who know vector multiplication, it is easy to use the Lorentz force directly:  F  =  q v X B ,  whence F  =  i dL X B . That is the origin of the diagram shown here.

The coil can also be considered as a magnetic dipole, or a little electromagnet,     as indicated by the arrow SN: curl the fingers of your right hand in the     direction of the current, and your thumb is the North pole. In the sketch     at right, the electromagnet formed by the coil of the rotor is represented     as a permanent magnet, and the same torque (North attracts South) is seen     to be that acting to align the central magnet.

All the best.
Win exciting gifts by                                                                                                              answering     the            questions       on                       Discussion                 Forum.      So                help                          discuss             any                             query      on                     askiitians            forum      and                 become     an              Elite                          Expert            League                              askiitian.

Sagar Singh
B.Tech, IIT Delhi

```
5 years ago
```										dear student,
DC motors are the simplest type; given a constant voltage, they run to a steady speed and steady current (electric torque= constant * current for DC motors). If you need to control the torque (current), you use a current sensor (a resistor) as feedback to control the current.If you need to control the speed, you use a speed sensor (tachometer, encoder etc) as a feedback to control the speed
Don’t forget to approve the answer if it is beneficial to you… !!
Now you can win exciting gifts by answering the questions on Discussion Forum. So help discuss any query on askiitians forum and become an Elite Expert League askiitian.
AMAN BANSAL
```
5 years ago

# Other Related Questions on Electromagnetic Induction

Define flux?

Flux: Flux is defined as the rate of flow of a property per unit area. For example, the magnitude of a river's current which gives the quantity of water flowing through a cross-section of...

 SAIMANIKANTA one year ago

a substance mixed with a solid to lower its melting point, used especially in soldering and brazing metals or to promote vitrification in glass or ceramics. if you like my answer plz approve...

 SAI SARDAR one year ago

Action or process of flowing out of a area

 Shantanu Singh one year ago
Can electromagnetic waves deaviate by electric and magnetic field

electromagnetic waves such as light are massless, chargeless and therefore are unaffected by electric and magnetic filed

 Ashutosh Mohan Sharma 10 months ago

@ sweta the electromagnetic waves are formed by combination of electric and magnetic field.. they being neutral cannot be deflected by electric and magnetic field.. in em waves equal...

 Umakant biswal 10 months ago

I think it`s because electromagnetic waves are just waves and have no positive or negative charge and therefore are not affected by electric or magnetic fields.

What is EMI?

Equated Monthly Installment,ELECTROMAGNETIC INDUCTION

 SHANMUKESHWAR one year ago

ELECTROMAGNETIC INDUCTION

 Rahul Jiji George one year ago

ELECTROMAGNETIC INDUCTION

 pa1 one year ago
what is work energy thereom...................................?

For any net force acting on a particle moving along any curvilinear path, it can be demonstrated that its work equals the change in the kinetic energy of the particle by a simple derivation...

 rahul kushwaha 2 months ago

To change the kinetic energy of a particle we have to apply a force on it and the force must do work on it. This relationship between KE and WORK is called "work -energy theorem...

 Ankur Saha 2 months ago

Relation bewteen KE and W: The work done on an object by a net force equals the change in kinetic energy of the object: W = KEf - KEi. This relationship is called the work-energy theorem.

 Shreyas Patil 3 months ago

The amount of work done by the net force acting on a particle is equal change in it’s kinetic energy.

 22 hours ago

work energy therom is nothing but the total work done by all forces is equal to the change in its kinetic energy …. W=1/2 {kx 2 2 -kx 1 2 }

 21 hours ago

Total workdone by the Net Force on the body is equal to change in it’s kinetic energy . W total =1/2{kx 2 2 -kx 1 2 }

 21 hours ago
The cieling of long hall is 25 m high What is the maximum horizontal distance that a ball thrown with a speed of 40 ms can go without hitting the ceiling of wall? Plz explain with a DIAGRAM

Let the angle of throwing be Q with respect to the ground So, the range is R = 40*cosQ*t where t = time taken reach ground. Now, we know the time taken to reach the top of its flight is...

 Tapas Khanda 3 months ago

Let the angle of throwing be Q with respect to the ground So, the range is R = 30*cosQ*t where t = time taken reach ground. Now, we know the time taken to reach the top of its flight is...

 Tapas Khanda 3 months ago

Diagram is not required to solve this question. You can directly use the formula to find range : R = (v^2/g)*sin2Q Maximum height reached, H = v^2*sin^2Q/2g So, 25 = 40^2*sin^2Q/(2*9.8) So, ...

 Tapas Khanda 3 months ago
a particle of mass m starts moving from origin along x axis and its velocity varies with position (x) as v=k√x. the work done by force acting on it during first "t" seconds is ???ans) (m k^4...

I want you to recheck your answer mr strange...you had written the value of a as k^2 ÷ 4 and you put that value at last as k^2 ÷ 2....Overall if u cann xplain it in brief i wud be...

 Vaibhav 14 days ago

sry it was a mistake , this is right.......... :) …...........................................................................................

 DR STRANGE 14 days ago

I dont understand how did you got (k dx)/(2√x dt).....and also this the integration of dx/√x should be x/2 but u wrote 2x how???

 Vaibhav 14 days ago
View all Questions »

• Complete JEE Main/Advanced Course and Test Series
• OFFERED PRICE: R 15,000
• View Details
Get extra R 3,000 off
USE CODE: CART20

• Electricity and Magnetism
• OFFERED PRICE: R 1,600
• View Details

Get extra R 320 off
USE CODE: CART20

More Questions On Electromagnetic Induction