18 - Magnetism Questions Answers

SIR ANSWER IS 4 could u pls explain
Asked By: AYUSH PAINE
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Joshi sir comment

SIR ANSWER IS given as C could u pls explain?

Asked By: AYUSH PAINE
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Joshi sir comment
Asked By: AYUSH PAINE
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SIR the answer is given only D could you pls explain
Asked By: AYUSH PAINE
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Joshi sir comment

XC=50Ω and XL=100Ω are in parallel.  Resultant is 100Ω capacitance.  Now 100Ω capacitance and 100Ω inductance give reactance 0Ω and resistance is 100Ω. So only option D is correct. 

 

Two Magnets of M magnetic dipole moment are placed shown in figure. What will be the intensity of magnetism at the point P shown in figure. 

Asked By: BONEY HAVELIWALA
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Joshi sir comment

the resultant dipole moment is √2M  thus  the resultant magnetic  field is  μ2√2M/4πd3   (ans)

CALCULATE  THE MAGNETIC FIELD  AT THE CENTRE OF SQUARE WIRE OF SIDE (2)1/2cm  AND CARRYING A CURRENT OF 10A.?

Asked By: GAUTAM SAGAR
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Joshi sir comment

method given by BONEY is correct but formula is not correct

it should be B = 4×{ (μ0I) / 4πR } × [sinθ1+ Sinθ2]

two short magnets of equal dipole momet M are fastened perpedicularat their centre.the magnitude of  magnetic feild at adistance d from the centre on the bisector of right angles is?

Asked By: AKANKSHA Solved By: SARIKA
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Joshi sir comment

the resultant dipole moment is √2M  thus  the resultant magnetic  field is  μ2√2M/4πd3   (ans)

this answer is given by sarika and is correct answer

is impedence as same as resistanace in a circuit // and // are capacitive reactance and inductive reactance constant values(i.e. independant of value of current in ac circuit at any time)  ?? 

Asked By: AAYUSH TANEJA
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Joshi sir comment

Write the question with correct symbols

 

yes it is equivalent to resistance for that circuit

 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
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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
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Joshi sir comment

yes this method is correct.

 

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
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Asked By: SARIKA SHARMA
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Joshi sir comment

B = μ0/2 * i/r

and i = e/T

and T = 2πr/v

solve

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