# 26 - Magnetism Questions Answers

What is chock coil?
Asked By: ROHITGARG 6 year agoSolved By: ARICA
Asked By: VIRAT 6 year ago

A bar magnet of magnetic moment 'm' and moment of inerta 'I' (about an axis passing through centre of mass and perpendicular to the magnet) is turned through 900 about the axis of suspension, to be at right angle to a uniform magnetic field B and then released. What is the angular velocity of the magnetwhile passing through the direction of the field ??

Asked By: VIRAT 6 year ago

A SIMPLE ELECTRIC MOTOR HAS AN ARMATURE RESISTANCE OF 1 ohm & RUNS FROM A D.C SOURCE OF 12V . IT DRAWS A CURRENT OF 2A WHEN UNLOADED . WHEN A CERTAIN LOAD IS CONNECTED TO IT ,IT SPEED REDUCES BY 10% OF ITS INITIAL VALUE ,THE CURRENT DRAWN BY THE UNLOADED MOTOR IS??

ANS 3A

Asked By: SARIKA SHARMA 15 Day ago

SIR , ISTHE FOLLOWG METH. IS CORRECT

R=1ohm , E=12V , I=2A

I=(E-e)/R => e=10 ON PUTTING D VALUES

NOW AS IT IS REDUCES BY 10% MEANS NOW e' = 9V ( 10/100 X 10 = 1 CHANGE , THUS FINAL = 10-1=9)

I= E-e'/R = ( 12-9)/ 1 = 3A (RESISTANCE IS KEPT CONST.) RESISTANCE WILL CHANGE OR NOT??

SARIKA SHARMA 15 Day ago

Asked By: SARIKA 7 year ago

yes this method is correct.

is megnatic & electric feild depend on the frame give proper illustration please?

Asked By: RISHABH GOUR 7 year agoSolved By: SARIKA

Q A SIMPLE ELECTRIC MOTOR HAS AN ARMATURE RESISTANCE OF 1 ohm  & RUNS FROM A D.C SOURCE OF 12V . IT DRAWS A CURRENT OF 2A WHEN UNLOADED . WHEN A CERTAIN LOAD IS CONNECTED TO IT ,IT SPEED REDUCES BY 10% OF ITS INITIAL VALUE ,THE CURRENT DRAWN BY THE UNLOADED MOTOR IS??

ANS 3A

Asked By: SARIKA SHARMA 7 year ago

velocity of e- in hydrogen atom is 2X106 m/s . the radius of orbit is 5X10-11 m . the mag induction at centre of orbit in T will be??

Asked By: SARIKA 1 Month ago

Asked By: SARIKA SHARMA 7 year ago

B = μ0/2 * i/r

and i = e/T

and T = 2πr/v

solve

potential diff b/w dees of cyclotron is V , if charge q comes out of it after completing n revolution then gain in KE of charge is 2nqV HOW?

Asked By: SARIKA 1 Month ago
Asked By: SARIKA SHARMA 7 year ago

when charge will move from first dee to second dee it will gain qV and on returning to first dee it will gain qV again so in one revolution it will gain 2qV so in n revolutions it will gain 2qVn

potential diff b/w dees of cyclotron is V , if charge q comes out of it after completing n revolution then gain in KE of charge is 2nqV HOW?

Asked By: SARIKA 7 year ago

velocity of e- in hydrogen atom is 2X106 m/s . the radius of orbit is 5X10-11 m . the mag induction at centre of orbit in T will be??

Asked By: SARIKA 7 year ago

B = μ0/2 * i/r

i = e/T

and T = 2πr/v

now solve