IB DP Physics Topic 5: Electricity and magnetism Question Bank SL Paper 1

Question

A cell has an emf of 4.0 V and an internal resistance of 2.0 Ω. The ideal voltmeter reads 3.2 V.

                                                         

What is the resistance of R?

A.     0.8 Ω

B.     2.0 Ω

C.     4.0 Ω

D.     8.0 Ω

Answer/Explanation

Markscheme

D

Question

A beam of electrons moves between the poles of a magnet.

                                                   

What is the direction in which the electrons will be deflected?

A.     Downwards

B.     Towards the N pole of the magnet

C.     Towards the S pole of the magnet

D.     Upwards

Answer/Explanation

Markscheme

D

Question

An electron enters the region between two charged parallel plates initially moving parallel to the plates.

M18/4/PHYSI/SPM/ENG/TZ2/20

The electromagnetic force acting on the electron

A.     causes the electron to decrease its horizontal speed.

B.     causes the electron to increase its horizontal speed.

C.     is parallel to the field lines and in the opposite direction to them.

D.     is perpendicular to the field direction.

Answer/Explanation

Markscheme

C

Question

A cell with negligible internal resistance is connected as shown. The ammeter and the voltmeter are both ideal.

M18/4/PHYSI/SPM/ENG/TZ2/19_01

What changes occur in the ammeter reading and in the voltmeter reading when the resistance of the variable resistor is increased?

M18/4/PHYSI/SPM/ENG/TZ2/19_02

Answer/Explanation

Markscheme

C

Question

Two resistors X and Y are made of uniform cylinders of the same material. X and Y are connected in series. X and Y are of equal length and the diameter of Y is twice the diameter of X.

The resistance of Y is R.

What is the resistance of this series combination?

A. \(\frac{{5R}}{4}\)

B. \(\frac{{3R}}{2}\)

C. 3R

D. 5R

Answer/Explanation

Markscheme

D

Question

Five resistors of equal resistance are connected to a cell as shown.

M18/4/PHYSI/SPM/ENG/TZ1/20

What is correct about the power dissipated in the resistors?

A.     The power dissipated is greatest in resistor X.

B.     The power dissipated is greatest in resistor Y.

C.     The power dissipated is greatest in resistor Z.

D.     The power dissipated is the same in all resistors.

Answer/Explanation

Markscheme

C

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