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Standard XII

Physics

Force on a Finite Wire

There is an e...

Question

There is an electric field E in x-direction. If the work done on moving a charge of 0.2 C through a distance of 2 m along a line making an angle $60^{\circ}$ with x-axis is 4 J, then what is the value of E?

\sqrt{3}

N/C

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4 N/C

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5 N/C

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20 N/C

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Solution

The correct option is D 20 N/C
The force on the charge q is $F = q E cos 60 = q E / 2$
Work done $W = F . r = \frac{q E}{2} . r$
or $E = \frac{2 W}{q r} = \frac{2 \times 4}{0.2 \times 2} = 20 N / C$

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There is an electric field E in x-direction. If the work done on moving a charge of 0.2 C through a distance of 2 m along a line making an angle 60∘ with x-axis is 4 J, then what is the value of E?

The correct option is D 20 N/CThe force on the charge q is F=qEcos60=qE/2Work done W=F.r=qE2.ror E=2Wqr=2×40.2×2=20N/C

There is an electric field E in x-direction. If the work done on moving a charge of 0.2 C through a distance of 2 m along a line making an angle $60^{\circ}$ with x-axis is 4 J, then what is the value of E?

The correct option is D 20 N/C
The force on the charge q is $F = q E cos 60 = q E / 2$
Work done $W = F . r = \frac{q E}{2} . r$
or $E = \frac{2 W}{q r} = \frac{2 \times 4}{0.2 \times 2} = 20 N / C$