Our database contains a total of 0 questions for physics Short Questions. You’ll prepare using this huge databank.
Generator produced electric current due to the movement of wires near very large magnets.
Motors and electric meters are based on the effect of magnetism.
It is the study of magnetic effect of current is called magnetism.
Electricity through vacuum by putting two electrodes in a sealed vacuum tube.
A : O,O,,I,I
X=A+B: O,I,I,I r
A coil wire consisting of many loops is called a solenoid the current carrying solenoid has a north and a south pole and behaves like a magnet.
Metals contain a large number of free electrons
The process of emission of electrons from hot metals surface is called thermionic emission.
Right hand with the thumb being stretched in the direction of conventional current the curl of fingers will point in the direction of magnetic lines of force.
If the secondary voltage is smaller than the primary voltage, the transformer is called step down transformer in step down transformer (NSLNP).
Transformer is an electrical device which is used to increase or decrease the value of the alternating voltage.
A : O,O,1,1
Symbol for AND operation is dot(.)
The phenomenon of production of induced current in one coil due to change current in a neighboring coil is called mutual induction.
The induction of an electromotive force in circuit when the current in that the current in that circuit is varied.
First law of faraday’s electromagnetic induction state that whenever a conductor are placed varying magnetic field emf are induced which is called induced.
The NOR gate operation is simply an OR operation followed by a Not operation.
X=A+B : 1,O,O,O
If the number of turns in the secondary coil is more than the number of turns in the primary coil then it is step up transformer.
Step down transformer:
If number of turns primary are more than the number of turns in the secondary than it is step down transformer.
Georage boole invented a special algebra called is a branch of mathematics which deals with relationships of logic variables.
Stretch the thumb forefinger and the middle finger of the left hand mutually perpendicular to each other .
Such circuits have been designed which implement the various logic operation these circuits are called logic gates.
D.C motor is a device which convents electrical energy into mechanical energy split rings is connect the soil the battery through carbon brushes when coil rotates in between the pole pieces of magnet split rings keeps the current in the coil and hence coil rotates in the field.
An electric lines of force is an imaginary catinuous field such that target to it any point gives the direction of the electric force at that point.
A.C generator converts mechanical energy electrical energy i.e it produces alternating .
We can set up electric field by applying a potential difference across two parallel metal plates placed horizontally separated with some distance.
A transformer is an electrical device which is used to increase or decrease the value of alternating voltage it cannot increase or decrease D.C voltage it works on the principle of matual induction.
The anode is connected to positive with potential and hence is used to accelerate the electrons.
The process of generating are induced current in a circuit by changing the number of magnetic lines of force passing through it is called electromagnetic induction.
These are coils used in transformer it the secondary voltage is smaller than the primary voltage the transformer is called step down transformer.
A battery produces a current in a wire placed inside the magnetic field of a permanent magnet. Current carrying wire produces its own field which interacts with the field of a magnet. As result the force will be exerted on wire towards left or right.
Feature of the force acting on current carrying wire: Michael Faraday discovered that the force of the wire is as right angle to both the direction of magnetic field and the direction of current. The force is increased if:
(i) the current in the wires is increased
(ii) strength of magnetic field is increased
(iii) the length of wire inside the magnetic field is increased
Finding the direction of force: the direction of forces acting on a current carrying wire conductor in a magnetic field can be founded by Fleming's left hand rule.1