Question 1 :
In cyclotron, for a given magnet, radius of the semicircle traced by positive ion is directly proportional to__________. (v=velocity of positron ion)<br/>
Question 2 :
The magnetic field normal to a coil of 40 turns area $ 3 cm^2 $ is B = (250 - 0.6t) millitesla. The emf induced in the coil will be
Question 3 :
A long solenoid has magnetic field strength of $3.14\times 10^{-2}\ T$ inside it when a current of $5\ A$  passes through it. The number of turns in $1\ m$ length of the solenoid is<br/>
Question 4 :
In a moving coil galvanometer a radial magnetic field is applied with concave magnetic poles, to have<br/>A) uniform magnetic field<br/>B) the plane of the coil parallel to field <br/>Choose the correct option among the following 
Question 5 :
In ballistic galvanometer, the frame on which the coil is wound is non-metallic to:
Question 6 :
Two streams of electrons are moving parallel to each other in the same direction. They_____<br/>
Question 7 :
Two parallel wires carrying current in the same direction attract each other because of<br>
Question 8 :
A wire of length $L$ is made in the form of a coil in a moving coil galvanometer. To have maximum sensitiveness the shape of the coil is <br/>
Question 10 :
Assertion: The coil is bound over the metallic frame in moving coil galvanometer.
Reason: The metallic frame helps in making steady deflection without any oscillation.
Question 11 :
In a cyclotron, If a deuteron can gain an energy of 40 MeV, then a proton can an energy of:
Question 13 :
If 6 mm is the distance moved by the thimble on the main scale for 6 rotations then pitch of the screw is :<br>
Question 14 :
Two streams of protons move parallel to eachother in the same direction. They will<br>
Question 16 :
Two straight parallel wires carrying current in the opposite directions repel each other, because of
Question 18 :
Which rule is used to find the direction of magnetic field in a toroid?
Question 19 :
A moving coil type of galvanometer is basedupon the principle that<br>
Question 20 :
When an electric current passes through a solenoid, the distance between any two adjacent rings of the solenoid _____.
Question 21 :
A rectangular loop carrying a current $i$ is placed in a uniform magnetic field $B$. The area enclosed by the loop is $A$. If there are $n$ turns in the loop, the torque acting on the loop is given by<br/>
Question 22 :
In cyclotron, for a given magnet, radius of the semicircle traced by positive ion is directly proportional to ($v=$ velocity of positive ion).<br/>
Question 23 :
In a moving cell galvanometer, we use a radial magnetic field so that the galvanometer scale is<br>
Question 24 :
<strong>Which of the following is likely to have the largest resistance?</strong><br>
Question 25 :
Why does toroid have a higher magnetic field than a solenoid?
Question 26 :
By inserting a soft iron piece into a solenoid, strength of the magnetic field
Question 28 :
The magnetic field generated along the axis of a solenoid is proportional to:<br/>
Question 29 :
If the current is doubled, the deflection is also doubled in
Question 31 :
Complete the following statements with an appropriate word / term to be filled in the blank space(s).<br/><br/>Magnetic field lines emerge from the _________ pole of a solenoid or a permanent magnet.<br/>
Question 32 :
The force of repulsion between two parallel wires is $f$ when each one of them carries a certain current I. If the current in each is doubled, the force between them would be
Question 33 :
Best method to increase the sensitivity of the moving coil galvanometer is to decrease<br/>
Question 34 :
Charged particle would continue to move with a constant velocity in a region wherein,
Question 35 :
Which of the following expressions are applicable to the moving coil galvanometer?
Question 36 :
An 8 cm long wire carrying a current of 10 A is placed inside a solenoid perpendicular to its axis. If the magnetic field inside the solenoid is 0.3 T, then magnetic force on the wire is
Question 37 :
When a current carrying coil is placed in a uniform magnetic field of induction $B$, then a torque $\tau $ acts on it. If $I$ is the current, $n$ is the number of turns and $A$ is the face area of the coil and the normal to the coil makes an angle $\theta $ with $B$, Then<br/>
Question 40 :
Two beams of protons moving parallel in same direction will :
Question 42 :
The radial magnetic field is used in a suspendedcoil galvanometer to provide<br>
Question 43 :
When a solenoid is activated, the force that moves the plunger is
Question 44 :
The sensitivity of a moving coil galvanometer increases with the decrease in <br/>
Question 46 :
The magnitude of the magnetic field inside along solenoid is increased by
Question 47 :
The magnetic field lines inside the solenoid are in the form of
Question 48 :
A coil of area $A$, turns $N$ and carrying current $i$ is placed with its face parallel to the lines of magnetic induction $B$. The work done in rotating the coil through an angle of $180^{0}$ is<br/>
Question 49 :
In a moving coil galvanometer, the magnetic pole pieces are made cylindrical and a soft iron core is placed at the centre of the coil,the purpose for doing so is:<br/>
Question 50 :
The number of turns per unit length in a toroid is $10^3$and current flowing in it is $\dfrac{1}{4\pi} A$, then the magnetic induction produced in it, is :
