Answer to Question #208860 in Mechanics | Relativity for Nightmare

Question #208860

A 5m long straight metal rod is kept on a horizontal table along east-west direction.

Assuming earth’s magnetic field as 0.4 G and angle of dip as 600

. Calculate induced emf in

the rod when it is moved with a velocity of 10 m/s along the direction of

(i)horizontal component of earth’s magnetic field

(ii) vertical component of earth’s magnetic field


1
Expert's answer
2021-06-21T11:41:17-0400

Explanations & Calculations


Available data

  • Magnetic field = 0.4G=0.4×104μT=0.4×1010T\small 0.4G = 0.4\times10^{-4}\mu T=0.4\times10^{-10}T
  • Angle of dip = 600\small 60^0
  • Speed of the moving rod = 10ms1\small 10ms^{-1}
  • Length of it = 5m\small 5m


Then,

  • The horizontal component of the field is

Bh=0.4G×cos60=0.2G\qquad\qquad \begin{aligned} \small \vec{B_h}&=\small 0.4G\times\cos60=0.2G \end{aligned}

  • Vertical component of it is

Bv=0.4G×sin60=0.346G\qquad\qquad \begin{aligned} \small \vec{B_v}&=\small 0.4G\times\sin 60=0.346G \end{aligned}


(1) When the rod is moved parallel to the horizontal component, it is the magnetic field's vertical component that is being cut by the rod.

  • Then the induced EMF will be

E=Bv.l.v=0.346×1010T×5m×10ms1=1.73×109V\qquad\qquad \begin{aligned} \small \vec{E}&=\small |\vec{B_v}|.l.v\\ &=\small 0.346\times10^{-10}T\times5m\times10ms^{-1}\\ &=\small \bold{1.73\times 10^{-9}V} \end{aligned}

(2) Similarly it is the horizontal component of the field that is being cut when the rod is moved parallel to the vertical component.

  • Then the induced EMF will be

E=0.2×1010×5×10=1nV\qquad\qquad \begin{aligned} \small \vec{E}&=\small 0.2\times10^{-10}\times5\times10\\ &=\small \bold{1\,nV} \end{aligned}


Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!

Comments

No comments. Be the first!

Leave a comment