Practice: Magnets And Charges In Motion

A small 2 nC charge moves at a speed of 10 m/s through a magnetic field of 1 0 5 10^{-5} Tesla oriented at 30 degrees with respect to the charge's velocity. What is the magnitude of the force the charge feels in Newtons ?


The answer is 1E-13.

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17 solutions

Ricky Escobar
Dec 17, 2013

The magnitude of the force on the charge is given by the equation $$F=qvB\sin \theta,$$ where q q is the charge, v v is the charge's speed, B B is the magnitude of the magnetic field, and θ \theta is the angle the magnetic field makes with the charge's velocity. Plugging in the values given, we get $$F=\left(2 \times 10^{-9} \ \mathrm{C}\right) \left( 10 \ \mathrm{\frac{m}{s}} \right) \left(10^{-5} \ \mathrm{T} \right)\sin 30^{\circ} $$ $$=\boxed{1 \times 10^{-13} \ \mathrm{N}} = 100 \ \mathrm{fN}. \ \ \mathrm{(100 \ femtonewtons)}$$

That's exactly what I got; for some reason the box claims the answer is -7...?

Limao Luo - 7 years, 5 months ago

Log in to reply

Same with me

Balaji Dodda - 7 years, 5 months ago

thats the same case with me

naitik bhise - 7 years, 5 months ago

F=Bil sin∅ =>F=B(Q/t)L sin∅ =>F=BQ (L/t) sin∅ =>F=BQV sin∅

Veerendra Kumar - 7 years, 3 months ago
Daniel Kurniawan
Dec 29, 2013

Insert to the equation : F = Q x V x B x sin tetha

  • F = magnitude of the force (Newton / N)
  • Q = charge (Coulomb / C)
  • V = speed (Meter per Second / m/s)
  • B = Magnetic Field (Tesla / T)

F = Q x V x B x sin tetha

F = 2^{-9} x10 x 10^{-5} x sin 30

F = 10^{-13}

Andi M
Mar 8, 2014

Lorentz Force Theory on moving particles

F = q × V × B × s i n θ F = q \times V \times B \times sin \theta

F = 2 × 1 0 9 × 10 × 1 0 5 × 1 / 2 F = 2 \times 10^{-9} \times 10 \times 10^{-5} \times 1/2

F = 1 × 1 0 13 F = 1 \times 10^{-13}

best

salman Ahmed - 7 years, 3 months ago
Sudipan Mallick
Apr 18, 2014

f=Bqvsin (thita) here, B=10^-5 T,v=10mps,sin(thita)=1/2 so f= 1E-13.

Nishant Sharma
Feb 13, 2014

F=QVB Sin(angle subtended)

Bvs Raghu
Feb 12, 2014

force acted on the charge is q(B X v) =q cross product of vectors(B,v) =q B v sin(angle) =2E-9 1E-5 10*0.5 =1E-13

Kiran K
Jan 19, 2014

F=qvbsin(theta) q=2E-9 v=10m/s b=E-5 sin 30=.5 f={2 10^(-9) 10 10^(-5) 0.5}=1E-13

We Know that

Force(F)=Bqvsin(theta)

So, F=1E-5* 2E-9 *10 *Sin30

      F=1E-13Newtons....

Is it Clear?????

Subbbarao Mantripragada - 7 years, 4 months ago

understood

Bushra Sherif - 7 years, 4 months ago
Agasthiyaraj L
Jan 18, 2014

F= q(v *B)

Aplicação direta da fórmula da força magnética na carga: F=q.V.B.senΘ, sendo F a força, q a carga, V a velocidade e B o campo magnético. F=2E-9 x 10 x 1E-5/2 ::F=1E-13

Bidur Kumar
Jan 14, 2014

F=q(VxB) F=qVBSin(a) Given, q=2x10^-9 V=10 B=10^-5 a=30 therefore, F=2x10^-9x10x10^-5xSin(30) F=1x10^-13 N

We know, from the formula of the Lorentz Force that :

F = Q (v × B ) \times B) , where Q is the charge, v is the velocity and B is the Magnetic Flux Density and the × \times is the Vector Cross Product .

Also, a × \times b = absin θ \theta

Now, putting the values in we get: F = 2 1 0 9 ( 1 0 5 ) 10 s i n ( 30 ) = 1 1 0 13 2*10^{-9}*(10^{-5})*10*sin(30) = \boxed{1*10^{-13}} N

Víctor Martín
Jan 6, 2014

F = q × B × v × sin α F=|q| \times |B| \times |v| \times \sin \alpha , where α \alpha is the angle formed by B B and v v .

If we do this equation, we'll get 1 0 13 \boxed{10^{-13}} .

Ahaan Rungta
Dec 31, 2013

It is well-known that F = q v B sin θ F = qvB \sin \theta . Using q = 2 1 0 9 C q = 2 \cdot 10^{-9} \, \text{C} , v = 10 m/s v = \text {10 m/s} , B = 1 0 5 T B = 10^{-5} \, \text {T} , and θ = 3 0 \theta = 30^\circ , we get F = 1 1 0 13 N F = \boxed {1 \cdot 10^{-13} \, \text{N}} .

Muhammad Anwar
Dec 22, 2013

Since We know that

F=qvBsin(angle)

Where

B= Magnetic field

v=velocity of charge

q=magnitude of charge

By putting values we get the answer

Nhat Le
Dec 19, 2013

The force is q v B s i n θ = ( 2 × 1 0 9 ) ( 10 ) ( 1 0 5 ) sin 3 0 = 1 × 1 0 13 N qvBsin\theta = (2 \times 10^{-9})(10)(10^{-5})\sin{30^\circ} = 1\times 10^{-13} \text{N}

Clifford Wilmot
Dec 19, 2013

Force , F = q v B sin θ \text{Force}, F=qvB\sin{\theta} , where q q is the charge, v v is the velocity, B B is the the magnetic field and θ \theta is the angle between the velocity and the magnetic field.

Hence F = 2 × 1 0 9 × 10 × 1 0 5 × sin 3 0 = 1 × 1 0 13 F=2\times 10^{-9}\times 10\times 10^{-5}\times \sin{30^{\circ}}=1\times 10^{-13} .

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