Physics 5 chapters

The opposite graph represents the relation between the electric current intensity (I) passing in conductor and its flow time (t) , then the electric charge that passes through cross -sectional area of that conductor in (10 s) equals...............?

• 5 C

• 10 C

• 15 C

• 50 C

Two wires are of the same material, the length of the second wire equals double the length of the first wire and its diameter equals the radius of first wire, so the ratio between the resistance of the second wire and that of the first wire equals...............?

• 1/8

• 8/1

• 1/2

• 2

• 
• 
• 
• 

In the shown electric, if the value of the variable resistance (S) is decreased, which of the following ratios decreases?

The opposite figure represents a part of an electric circuit, so the magnitude of the electromotive force ( V_B )equals ..............?

• 3 V

• 4 V

• 6 V

• 8 V

In the opposite figure, a straight wire is placed perpendicular to a uniform magnetic field of flux density (B) that is directed into the page. When an electric current of intensity (I) passes in the wire, the total magnetic flux density at point {P} becomes (3 B) so the net magnetic flux density at point {Q} is .................?

• Zero

• B

• 2 B

• 3 B

• B or 2 B

• B or 5 B

• B or 3 B

• Zero or B

A circular coil of radius (2.2 cm) carries an electric current, hence a magnetic flux of density (B) is produced at its center, so if its turns are drawn away uniformly from each other till it becomes (110 cm) long , the magnetic flux density at its center will equal ..................?

• B

• 2 B

• 0.5 B

• 0.04 B

In the opposite figure, the ratio between the magnetic force acting on wire (x) to that acting on wire (y) is ...............?