Magnetic field due to currentHard
Question
A proton moving with a constant velocity passes through a region of space without any change in its velocitiy. If E and B represent the electric and magetic fields respectively. Then, this region of space may have
Options
A.E = 0, B = 0
B.E = 0, B ≠ 0
C.E ≠ 0, B = 0
D.E ≠ 0, B ≠ 0
Solution
If both E and B are zero, then 
and 
both are zero.
Hence, velocity may remain constant. Therefore, option (a) is correct.
If E = 0, B ≠ 0 0 but velocity is parallel or antiparallel to magnetic field, then also
and 
both are zero. Hence option (b) is correct.
If E ≠ 0, B ≠ 0 but + = 0, then also velocity may remain constant or option (d) is also correct.
and both are zero.Hence, velocity may remain constant. Therefore, option (a) is correct.
If E = 0, B ≠ 0 0 but velocity is parallel or antiparallel to magnetic field, then also
and both are zero. Hence option (b) is correct. If E ≠ 0, B ≠ 0 but
+ = 0, then also velocity may remain constant or option (d) is also correct.Create a free account to view solution
View Solution FreeMore Magnetic field due to current Questions
Two concentric coils each of radius equal to 2π cm are placed at right angles to each other. 3 ampere and 4 ampere ...A magnet makes 40 oscillation per minute at a paece having magnetic intensity of 0.1 × 10-5 tesla. At another place...A bar magnet has a magnetic moment equal to 5 × 10-5 A-m2. It is supended in a magnetic field of 8π × 10-...The magnetic moment of a straight wire of length L is M. If the wire is bent in form of a semicirle then its magnetic mo...A charged particle is projected in a plane perpendicular to a uniform magnetic field. The area bounded by the path descr...