Question 1 :
An eleclron is travelling horizontallty towards east. A magnetic field in vertically downward (inside the plane of paper) direction exerts a force on the electron along

Question 2 :
The magnetic field due to a circular wire at its center is:

Question 3 :
A circular coil of radius $R$ carries an electric current. The magnetic field due to the coil at a point on the axis of the coil located at a distance $r$ from the centre of the coil, such that $r > > R$, varies as

Question 4 :
A electron with kinetic energy $k$ enters a region (i) uniform magnetic field (ii) non-uniform magnetic field and comes out with kinetic energy $k_1$ and $k_2$ respectively. What is relation between $k_1, k_2$ and $k$?

Question 5 :
Imagine that you are seated in a room and there&#160;is a uniform magnetic field pointing vertically&#160;downwards in it . At the center of the room an&#160;electron is projected horizontally&#160;with a certain&#160;speed. The path of the&#160;electron in this field are:<br/>

Question 6 :
A particle of mass m and change q moving with velocity $ &#160; V {&#160; }&#160; $ enters a region of uniform magnetic field of induction $ B {&#160; }$ . Then

Question 7 :
A charged particle is projected perpendicular to a&nbsp;uniform magnetic field. Arrange the following in&nbsp;correct order of occurrence :&nbsp;<br>A) The direction of momentum of the particle&nbsp;changes<br>B) The particle experiences a force<br>C) The particle revolves in a circular path<br>

Question 8 :
A coil of one turn is made of a wire of certain length and then from the same length a coil of two turns is made. If the same current is passed in both the cases, then the ratio of the magnetic induction at their centres will be:<br>

Question 9 :
When a charged particle moves in a magnetic field its kinetic energy __________.

Question 10 :
A length of wire carries a steady current. It is bent first to form a circular plane coil of one turn. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same current is<br>

Question 11 :
An electron is moving on a circular path of radius $r$ with speed $v$ in a transverse magnetic field $B$. $e/m$ for it will be&nbsp;

Question 12 :
A boy peddles a stationary bicycle the pedals of&#160;the bicycle are attached to a 200 turn coil of area 0.10 $m^2$. The coil&#160;rotates at half a revolution per second and it&#160;is placed in a uniform magnetic field of 0.02 T perpendicular to the&#160;axis of rotation of the coil. The maximum voltage generated in the Coil is then<br/>

Question 13 :
A helium nucleus makes a full rotation in a circle of radius $0.8\ m$ in two seconds. The value of the magnetic field $B$&nbsp;at the centre of the circle will be<br>

Question 14 :
A current of 10 A flows in a circular coil of 1000 turns and radius 0.1 m. Find the magnitude of the magnetic field at the centre of the circular coil.

Question 15 :
A charge $q$ coulomb moves in a circle at $n$ revolutions per second and the radius of the circle is $r$ metre. Then magnetic field at the center of the circle is<br>

Question 16 :
<span>A current flows in a circular arc of wire whose <span>radius is $R$, which subtends an angle $\cfrac{3\pi}{2}$ radian at its centre. The magnetic field $B$ at the centre is</span></span>