امتحان مادة Physics ||| لشهر اكتوبر

In the opposite figure :The radius of the coil 8cm and radius of the wire 2mm

The resistance of the coil is 

In the opposite figure :The radius of the coil 8cm and radius of the wire 2mm

The resistivity is 

a) 1.5×10^-4 

b) 1.88×10⁸ 

c) 4×10⁵

d) 8×10⁶

The e.m.f of the battery in this circuit is V_B = 9 volt & its Internal resistance r = 1Ω

The ratio between indications of A when K is closed and when K is open is …………. Ampere

The e.m.f of the battery in this circuit is V_B = 9 volt & its Internal resistance r = 1Ω

the indications of A₁ when K is closed and when K is open is ……….. Ampere

A direct current generator has an e.m.f. 120 V. When the output current is 20 A the terminal potential is 115V

What is the internal resistance of the generator? 

A direct current generator has an e.m.f. 120 V. When the output current is 20 A the terminal potential is 115V

What is the terminal voltage when the output is 40A? 

In the circuit shown in the figure, what is the value of the resistance which connected to CD such that the voltage B = the voltage D ………….. ohm

the equivlent resistance ………….

emf …………

In the shown circuit :

If K is open :

In the shown circuit :

If K is closed : 

In the shown circuit :

If K is closed & we increase R₁ : The indication of 

In the shown circuit , if the resistance R₁ decreases then :

In the electric circuit shown in the figure the reading of the ammeter is 2  ampere. When the key was closed the reading becomes 3 amperes.

the internal resistance of the battery ………… Ω

In the electric circuit shown in the figure the reading of the ammeter is 2  ampere. When the key was closed the reading becomes 3 amperes.

the E.M.F of the battery ………….

When key is Closed Rt = 5 Ω , When key is Opened  Rt = ………….. ?

If the switch in the circuit shown in the figure is closed the value of equivalent resistance decreases to half its value of resistance R(Knowing that the internal resistance of electric cell is neglected) …….. Ω

the current intensity pass through 6 ohm

find the current pass in branch x ……………. and the direction of current pass in y is …………

The value of VB which makes the reading of ammeter zero is ………. A

Caculate the equivalent resistance

FIND the potential difference between X,Y 

V_B2  if the internal resistance are neglected

in the opposite figure

I₃= ……… A

At point a I_{2= ………….. A}

Two currentsI,2I pass in two parallel wires as in the figure, when moving wire Y away from wire X the magnetic flux density at point C ………

Two long parallel wires A,B carry equal current in the opposite direction , if the magnetic flux density resulting from an electric current in wire A at mid Point between the two wires is B, so the total magnetic Flux density at midpoint is ………

in the opposite  figure , if the distance between the two wires 4 d. so , the natural point is the …… point

In which of the following coils the magnetic flux density at its center is the maximum  value ?…….    

In the opposite figure a circular wire ring and a straight wire placed at the position x in the same plane of the ring and both carries electric current its intensity I so that resultant magnetic flux density at the center of the ring c is B and when the wire is moved to position y the magnetic flux density at point c becomes ………

A coil is placed where its plane is perpendicular to a magnetic flux of density 2 × 10^-5 Tesla, an electric current passes through it and then the coil is rotated around its vertical diameter by angle 180°. The total field (the total magnetic flux density) becomes 1/3 of its original value and in opposite direction, find the current intensity given that the number of its turns is 28 turns and its radius is 5.5 cm ………… A

a circular coil formed of one turn carries electric current intensity I, if the magnetic flux density at its center is B1 and  then it is reshaped to another circular coil of N turns and carried the same current intensity, then the magnetic flux density at its center will be ………

a) NB₁

b) N²B₁

c) 2NB₁

d) 2N²B₁

In the shown figure a resistance wire in the form of an equilateral triangle the current enters from point A and emerges from point C, so the total magnetic flux at point P is: