The magnetic induction at point P, which is 4 cm from a long current-carrying wire is 10-8 Tesla. What would be the field of induction at a distance of 12 cm from the same current?
1. | 3.33 x 10-9 Tesla |
2. | 1.11 x 10-4 Tesla |
3. | 3 x 10-3 Tesla |
4. | 9 x 10-2 Tesla |
Two straight horizontal parallel wires carry the same current in the same direction, and d is the distance between them. You are given a small magnetic needle that is freely suspended. Which of the following positions will have the needle's orientation independent of the magnitude of the current in the wires?
1. | At a distance d/2 from any of the wires in any plane. |
2. | At a distance d/3 from any of the wires in the horizontal plane. |
3. | Anywhere on the circumference of a vertical circle of radius d and centre halfway between the wires. |
4. | At points halfway between the wires in the horizontal plane. |
In the figure shown, the magnetic induction at the centre of the arc due to the current in portion AB will be
(a) (c)
(b) (d) Zero
In a current-carrying long solenoid, the field produced does not depend upon:
1. | Number of turns per unit length | 2. | Current flowing |
3. | Radius of the solenoid | 4. | All of the above |
A neutral point is obtained at the centre of a vertical circular coil carrying current. The angle between the plane of the coil and the magnetic meridian is :
a) 0 (b) 45°
(c) 60° (d) 90°
If the current is flowing in the south direction along a power line, then what will be the direction of the magnetic field above the power line (neglecting the earth's field)?
1. | South | 2. | East |
3. | North | 4. | West |
An electron and a proton with equal momentum enter perpendicularly into a uniform magnetic field, then :
(1) The path of proton shall be more curved than that of electron
(2) The path of proton shall be less curved than that of electron
(3) Both are equally curved
(4) Path of both will be a straight line
Two particles A and B of masses and respectively and having the same type of charge are moving in a plane. A uniform magnetic field exists perpendicular to this plane. The speeds of the particles are and respectively, and the trajectories are as shown in the figure. Then
(1)
(2)
(3)
(4)
An electric current passes through a long straight wire. At a distance 5 cm from the wire, the magnetic field is B. The field at 20 cm from the wire would be :
(1)
(2)
(3)
(4)
Two particles X and Y having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describes circular path of radius and respectively. The ratio of mass of X to that of Y is :
(a) (b)
(c) (d)