Physics - 2013 E.C (2020/2021) Ethiopian University Entrance Exam (EUEE)

A current traversing any closed loop at particular time is zero.

B the potential drop at a given junction equals the electromotive force at that particular point

C charge entering the junction equals the charge leaving that junction at a particular time.

D the sum of the voltage drop across any closed loop equals the sum of electromotive force.

A There is a tendency to oppose the applied magnetic field in a diamagnetic substance.

B The unpaired electrons in diamagnetic materials will align with the applied magnetic field and parallel to each other.

C The unpaired electrons in ferromagnetic materials will align with the applied magnetic field and parallel to each other.

D The unpaired electrons in paramagnetic substance which will tend to align themselves in the same direction as the applied magnetic field.

A

B

C

D

A The current through a coil of the wire generates a magnetic field at the center of the coil

B It consists of a coil of insulated copper wire on a circular magnetic frame.

C The current is inversely proportional to the tangent of the angle of the needle's deflection.

D It is a device used to measure the electric current in terms of the electric field it produces.

A Doubling the current through the conductor doubles the field strength.

B Reversing the current direction will reverse the direction of the magnetic field.

C The magnetic field encircles the conductor.

D The field strength is directly proportional to the distance from the conductor.

A 3.2 mV

B 9.0 mV

C 18 mV

D 1.8 mV

A 3.0 A/s

B 0.30 A/s

C 0.33 A/s

D 3.3 A/s

A Coil with larger number of turns produce greater induced electromotive forces.

B Moving a magnet relative to the coil and the coil relative to the magnet with equal speed will produce the same electromotive force.

C The magnitude of the induced electromotive force is directly proportional to the relative velocity between the two.

D The direction in which the coil moves relative to the magnetic field does not have any effect on the induced electromotive force.

A It enables to reach the consumers at very high voltage.

B It enables a transformer to increase or decrease the voltage as required.

C It completely avoids energy loss due to heating.

D It uses very high current in the transmission line.