# 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.

Thanks in advance sir.

**Asked By: PRABHAN BUGATHA**

**submit your answer**

**Asked By: TUSHAR GUPTA**

**read solutions ( 2 ) | submit your answer**

**Joshi sir comment**

**Asked By: LUFFY**

**submit your answer**

**Joshi sir comment**

$Magnetictorque=\overrightarrow{M}\times \overrightarrow{B}=i\overrightarrow{A}\times \overrightarrow{B}\phantom{\rule{0ex}{0ex}}Torqueduetogravityaboutthepointof\phantom{\rule{0ex}{0ex}}circumference=\overrightarrow{R}\times m\overrightarrow{g}\phantom{\rule{0ex}{0ex}}Nowcomparethetwo$Inform for any issue

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

**Asked By: GAUTAM SAGAR**

**read solutions ( 1 ) | submit your answer**

**Joshi sir comment**

method given by BONEY is correct but formula is not correct

it should be **B = 4×{ (μ _{0}I) / 4πR } × [sinθ_{1}+ Sinθ_{2}]**

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**

**read solutions ( 1 ) | submit your answer**

**Joshi sir comment**

the resultant dipole moment is √2M thus the resultant magnetic field is μ2√2M/4πd^{3} (ans)

this answer is given by sarika and is correct answer

velocity of e^{-} in hydrogen atom is 2X10^{6} 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**

**submit your answer**

**Joshi sir comment**

B = μ_{0}/2 * i/r

and i = e/T

and T = 2πr/v

solve