2017-2018) University Physics Final Examination Paper ID in the class: Name : St

Question

2017-2018) University Physics Final Examination Paper ID in the class: Name : Student ID Part 1. Single selection (3 Marks for cach question. Total 30 Marks) . Electrie field strength can have the units of 2. An electron is projected from left to right into a flux density of 03 T directed into the paper. If the speed of the electron is 2x10 m/s, the magnetic force will be 3. The magnetic field points into the page and is increasing. So the D) Unknown 4. Just after two identical point charges are released when they are a induced current in the loop is A) Clockwise B) Counter clockwise C) No current .. . . distance D apart in outer space, they have an acceleration a. If you release them from a distance 2D instead, their acceleration will be A) a/4 D) 4a 5. The magnetic flux density at a distance r from a long, current-carrying, straight wire is proportional to A)r B 6. Calculate the magnitude of the flux of a constant electric field of 5.00 N/C in the A)0 B)10.0 N m/C C20.0 Nm2/C D) More information is needed 7. A rectangular loop of wire 20 cm wide and 30 cm long makes an angle of 30° with -direction through a rectangle with area 4.00 m2 in the xy-plane. ) a magnetic flux density of 0.3 T. The flux penetrating the loop is approximately A) 0.009Wb B) 0.016Wb C) 9Wb D) 155 Wb . In simple harmonic motion, the radius of the reference circle corresponds most closely with the actual A) displacement B) velocity C) amplitude D) period A 2-kg steel ball i attached to the end of a fliat strip of metal that is clamped at its ase. If the spring constant is 8 N/m, the frequency of vibration will be pproximately )

Explanation / Answer

1. The correct option is B) N C-1.

Electric Field = Electrostatic force / Charge = N C-1.

2. The correct option is A) 9.6 10-14 N.

The magnetic force F = q v x B = 1.6 x 10-19 x 2 x 106 x 0.3 = 9.6 10-14 N

3. The correct option is B) Counter-clockwise.

The magnetic field is pointing downward and is increasing i.e. the flux is increasing. The current is induced in such a way that it opposes the change in flux. Hence, the induced current is counter-clockwise.

4. The correct option is A) a/4.

As F 1/D2 => a 1/D2. When D->2D => a->a/4.

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