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

 

Below figures (1) and (2) represent lines of force. Which is correct statement  ?

(1) Figure (1) represents magnetic lines of force

(2) Figure (2) represents magnetic lines of force

(3) Figure (1) represents electric lines of force

(4) Both figure (1) and figure (2) represent magnetic lines of force

A vertical wire kept in Z-X plane carries a current from Q to P (see figure). The magnetic field due to current-carrying wire will have the direction at the origin O along :

1. OX

2. OX'

3. OY

4. OY'

In a current-carrying long solenoid, the field produced does not depend upon:

For the magnetic field to be maximum due to a small element of current-carrying conductor at a point, the angle between the element and the line joining the element to the given point must be:

1. 0°                           
2. 90°
3. 180°                        
4. 45°

An electron and a proton with equal momentum enter perpendicularly into a uniform magnetic field, then :

Cyclotron cannot be used to accelerate

1. Electrons                       

2. Neutrons

3. Positive ions                   

4. Both (1) and (2)

 The dimension of the magnetic field intensity B is:

1.  ${\mathrm{MLT}}^{-2}{\mathrm{A}}^{-1}$                   

2.  ${\mathrm{MT}}^{-2}{\mathrm{A}}^{-1}$

3.  ${\mathrm{ML}}^2{\mathrm{TA}}^{-2}$                       

4.  ${\mathrm{M}}^2{\mathrm{LT}}^{-2}{\mathrm{A}}^{-1}$

An $\mathrm{\alpha }-$ particle travels in a circular path of radius 0.45 m in a magnetic field $\mathrm{B}=1.2 Wb\mathit{/}{m}^{\mathit{2}}$ with a speed of $2.6\times {10}^7 m\mathit{/}sec$ . The period of revolution of the $\mathrm{\alpha }-$ particle is :

1.  $1.1\times {10}^{-5 }$ sec          2.  $1.1\times {10}^{-6}$ sec

3.  $1.1\times {10}^{-7}$ sec            4.  $1.1\times {10}^{-8}$ sec