Physics 3rd year 2

A potential difference of 12 V is applied between the terminals of a conductor to move 6.25 × 10¹⁸ electrons through a cross -section of this conductor within two seconds, then the resistance of the conductor is .......

• 6.2 A

• 8.2 A

• 9.6 A

• 12.5 A

• 1/2

• 1/3

• 1/4

• 1/6

The opposite figure represents a part of an electric circuit. If the voltmeter reads 1 V , then the potential difference between the two points X and Y equals .........?

• 1 V

• 2 V

• 3 V

• 4 V

In the opposite electric circuit, if the voltmeter reading is 6 V , the resistance R equals ..........?

In the opposite electric circuit, the readings of the voltmeters V₁ and V₂ are.............., ............... respectively

• 2.25 V , 5.5 V

• 4.8 V , 4.8 V

• 2.25 V , 2.25 V

• 4.8 V , 2.4 V

The opposite diagram represents a part of an electric circuit, so the voltmeter reading is ............?

• 20 V

• 30 V

• 40 V

• 50 V

A straight wire is carrying a current of intensity (4 A) . If the density of the magnetic flux at a certain point around the wire is (2 × 10^-5 T) , the separating distance of this point from the axis of the wire equals .................?

• 0.01 m

• 0.02 m

• 0.03 m

• 0.04 m

The opposite figure shows two parallel long wires (1), (2) which are separated by a distance of 20 cm in the same plane of the page. Wire (1) carries a current of intensity "9 A" , so the magnitude and the direction of current I in wire (2) that makes the net magnetic field at point X vanishes is ................ ?

• 4.5 A from a to b

• 4.5 A from b to a

• 3 A from a to b

• 3 A from b to a