Magnetic Effects Of Current(11th And 12th > Physics ) Questions and Answers
A straight wire of length (π2) metre is carrying a current of 2A and the magnetic field due to it is measured at a point distant 1 cm from it. If the wire is to be bent into a circle and is to carry the same current as before, the ratio of the magnetic field at its centre to that obtained in the first case would be
Explanation:-
Answer: Option B. -> The magnetic field at any point inside the pipe is zero:
B
Applying Ampere's law ∮B.dl=μ0i to any closed path inside the pipe, we can understand that as the currect enclosed inside it is zero, the magnetic field will be equal to zero.
Explanation:-
Answer: Option A. -> Attraction force when in parallel and repulsion force when in series:
A
When connected in parallel the current will be in the same direction hence the wires attract each other and when connected in series the current will be in the opposite direction. Hence they repel each other.
Two very long, straight and parallel wires carry steady currents I and I respectively. The distance between the wires is d. At a certain instant of time, a point charge q is at a point equidistant from the two wires in the plane of the wires. Its instantaneous velocity v is perpendicular to this plane. The magnitude of the force due to the magnetic field acting on the charge at this instant is
Explanation:-
Answer: Option D. -> 0:
D
According to gives information following figure can be drawn, which shows that direction of magnetic field is along the direction of motion of charge so net force on it is zero.
if the currents are parallel then the net magnetic field at midpoint will be zero, Hence, no magnetic force acts on it.