Q. No.
1. \(0.25~\text{N-m}\)
2. \(5.2~\text{N-m}\)
3. \(2.5~\text{N-m}\)
4. \(0.52~\text{N-m}\)
A circular coil of wire of radius 'r' has 'n' turns and carries a current 'I'. The magnetic induction (B) at a point on the axis of the coil at a distance from its center is :
1.
2.
3.
4.
The dots in the figure depict a magnetic field that is perpendicular to the plane of the paper and emanates from it. The trajectory of a particle in the plane of the paper is depicted by the curve \(ABC\). What exactly is the particle?
| 1. | Proton. | 2. | Electron. |
| 3. | Neutron. | 4. | It cannot be predicted. |
| 1. | the speed will change. |
| 2. | the direction will change. |
| 3. | both (1) and (2) |
| 4. | none of the above |
| 1. | \(B\) acts along the \(x\text-\)axis |
| 2. | \(B\) acts along the \(y\text-\)axis |
| 3. | \(B\) acts along the \(z\text-\)axis |
| 4. | \(B\) can act along any of the above direction for the net force to be zero |
The figure shows a particle of charge q and mass m moving with velocity v along the x-axis enters a region of the uniform magnetic field. The minimum value of v so that the charge q is deflected by an angle is
1.
2.
3.
4.
An electron is traveling along the x-direction. It encounters a magnetic field in the y-direction. Its subsequent motion will be:
1. Straight-line along the x-direction
2. A circle in the xz-plane
3. A circle in the yz-plane
4. A circle in the xy-plane
A positively charged particle descends vertically. In which direction will the horizontal component of the earth's magnetic field deflect?
1. east
2. west
3. north
4. south
The unit of reduction factor of the tangent galvanometer is
1. Ampere
2. Gauss
3. Radian
4. None of these
When a proton is released from rest in a room, it starts with an initial acceleration towards the east. When it is projected towards the north with a speed , it moves with initial acceleration towards east. The electric and magnetic fields in the room are -
1.
2.
3.
4.
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