# 14 - Moving charge magnetism and force in magnetic field Questions Answers

An electron originates at a point A lying on the axis of a straight solenoid and moves with a velocity v at an angle α to the axis. The magnetic induction of the field is B. Find the distance r from the axis to the point on the screen into which the electron strikes. The screen is oriented at right angles to the axis and is located at a distance l from the point A.

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

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
Joshi sir comment

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

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

Joshi sir comment

B = μ0/2 * i/r

and i = e/T

and T = 2πr/v

solve