Question

hone of the above a. 105 N b. 128 N c. 152 N v. How Jong must the rails be if the wire, starting from rest, is to reach a speed of 300 m/s? d. 13.46 m e. none of the above a. 0.599 m b. 5.92 m c. 9,56 m 8. A particle with unknown mass m and charge q moves with constant speed v 2.9 x 10° m/s as it passes undeflected through a pair of parallel plates as shown below. The plates are separated by a distance of d 5 x 10 m and a constant potential difference V is maintained between them. A uniform magnetic field of magnitude B- 0.3 T directed into the page exists both between the plates and in a region to the right of them. After the particle passes into the region to the right of the plates where only the magnetic field exists, its trajectory is circular with radius r = 0.2 m. x x x X X X - -------- 9. m, v x x x x a. What is the sign of the charge of the particle ? Neutral Cannot be determined Positive Negative Justify your answer.

Answer 1

Solution 8 :

x x x x X x X x X X The magnetic field x is directed into the x x x x x page. In the plate region the papele min be indeflected because the Lorentz magnetic fone is balanced by the electric force in this region. The magnetic field is acting downward (2) . The eletric fone mis be upworld (1) i l torbe 6. The magnetic fore q[ux B) outside stre plate it bends into circle. The chaye & is positine. The sign of the charge = tve. B The Electric tone is acting upward to the plate The electric field will be from lower plate to upper plate ( ap direction). 1 ② The electric fone is balanced by the magnetic fine inside the plate. .: QE = q VB E = VB i pratial at topplate - V- Ed - VBA of the lower plate is zero Then upper plate will be at porential -- Bud volt) & In the region here only magnetic field exists There the magnetic field is balanced by the centrifugal force my UVB & my as charge / mars ration

Putting the respective values of v , d , B and r you will get the results . I have explained rest .