A thin wire bent to form a circle and carrying a current I has a magnetic moment M. The shape of the wire is changed to a square and it carries the same current. It will have a magnetic moment
(1)
(2)
(3)
(4)
A scalar quantity is one that:
1. | is conserved in a process. |
2. | will never accept negative values. |
3. | must be dimensionless. |
4. | has the same value for observers with different orientations of axes. |
The position of a particle in a rectangular co-ordinate system is (3, 2, 5). Then its position vector will be:
1.
2.
3.
4. None of these
A force of 5N acts on a particle along a direction making an angle of with vertical. Its vertical component will be:
1. 10 N
2. 3 N
3. 4 N
4. 2.5 N
is a vector with magnitude A, then the unit vector in the direction of is
1.
2.
3.
4.
If , then the direction cosines of the vector are:
(direction cosines (or directional cosines) of a vector are the cosines of the angles between the vector and the three +ve coordinate axes.)
1.
2.
3.
4.
The vector that must be added to the vector and so that the resultant vector is a unit vecotr along the y-axis is
1.
2.
3.
4. Null vector
Surface area is:
1. Scalar
2. Vector
3. Neither scalar nor vector
4. Both scalar and vector
A force \(\mathrm{F}\) applied at a \(30^\circ\) angle to the \(\mathrm{x }\)-axis has the following X and Y components:
1.
2.
3.
4.
Angular momentum is
1. A scalar
2. A polar vector
3. An axial-vector
4. None of these