Question 5 (1 point) A wire along the z-axis carries a current of 4.9 A in the p

Question

Question 5 (1 point) A wire along the z-axis carries a current of 4.9 A in the positive z direction (take the positive z direction to point towards you!) Find the force (magnitude and direction) exerted on a 3.3 cm long length of the wire by a uniform magnetic field with magnitude 0.43 T in the positive x direction. A) 0.07 N in the out of the page B) 0.07 N in the positive y direction O C) 0.07 N in the into the page O D) 0.07 Nin the positive -y direction E) 0.07 N in the positive -x direction Save Question 6 (1 point) A particle with charge q =-1.9 x 10% C and mass m-3.1x 1?12 kg travelling at 8.1 × 103 m/s enters a uniform magnetic field of 0.2 T. If the magnetic field is increased to 0.4 T and the velocity is increased by a factor of 4, the new radius of curvature which the particle follows is equal to what? Save

Explanation / Answer

5.

Magnetic force is given by

F=L(IxB) =0.033*(4.9k x 0.43i)

F=0.07 N j

Therefore answer is 0.07 N in positive Y-direction.

6.

Here centripetal force is balanced by magnetic force

mv2/R =qvB

=>R=mv/qB

=>R2/R1 =(V1/V2)(B2/B1)

R2=R1 *(V1/4V1)(0.4/0.2)

R2 =(1/2)R1

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