What are the expressions for the magnitude of electric field

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Q. A conductor is made in the form of a hollow cylinder with inner radius a=1.00cm and outer radius b=2.00cm. It carries current I=12.0A uniformly distributed over its cross section. What are the expressions for the magnitude of the electric field in the regions r<a, a<r<b, and r>b?

Q. A 2100 kg car moving east at 10.0 m/s collides with a 3000 kg car moving north. The cars stick together and move as a unit after the collision, at an angle of 35.0° north of east and at a speed of 5.03 m/s. Find the speed of the 3000 kg car before the collision.

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What are the expressions for the magnitude of electric field : A 2100 kg car moving east at 10 m/s collides with a 3000 kg car moving north. The cars stick together and move as a unit after the collision, at an angle of 35 ° north of east and at a speed of 5.03 m/s. Find the speed of the 3000 kg car before th..

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