A current-carrying closed Loop in the form of a right isosceles triangle ABC is placed in xy plane in a uniform magnetic field acting along the y-axis as shown in the figure. If the magnetic force on the arm AC is , then force on the arm BC and AB are respectively
(1) zero, zero
(2)
(3)
(4)
A uniform electric field and a uniform magnetic field are acting in the same direction in a certain region. If a proton is projected in this region such that its velocity is pointed along the direction of fields, then the proton :
1. will turn towards the left of the direction of motion
2. will turn towards the right of the direction of motion
3. will speed up
4. will slow down
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.
When an electron enters perpendicularly in a magnetic field with velocity v, time period of its revolution is T. If it enters in the same magnetic field with a velocity 2v, then its time period will be:
1. 2T
2. 4T
3.
4. T
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 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
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. |
The electric charge in uniform motion produces :
(1) An electric field only
(2) A magnetic field only
(3) Both electric and magnetic field
(4) Neither electric nor magnetic field
An electron and a proton enter a magnetic field perpendicularly. Both have the same kinetic energy. Which of the following is true:
1. Trajectory of electron is less curved
2. Trajectory of proton is less curved
3. Both trajectories are equally curved
4. Both move on a straight-line path