Question 1

Which of the following best describes simple harmonic motion (SHM)?

Accepted Answer

A motion where the restoring force is proportional to the displacement from equilibrium and acts in the opposite direction.

Question 2

A mass $$m$$ attached to a spring with spring constant $$k$$ oscillates with a period $$T. $$Which equation correctly gives the period of oscillation?

Accepted Answer

$$T = 2\pi\sqrt{\frac{m}{k}}$$

Question 3

For a simple pendulum of length $$l$$ and gravitational acceleration $$g$$, what is the period of oscillation for small angles?

Accepted Answer

$$T = 2\pi\sqrt{\frac{l}{g}}$$

Question 4

Which statement about the energy in a system exhibiting SHM is correct?

Accepted Answer

The total energy is constant and equals $$\frac{1}{2}kA^2$ for a spring-mass system.

Question 5

A physical pendulum has mass $$m$$, moment of inertia $$I$$, and its center of mass is a distance $$d$$ from the pivot. What is the period for small oscillations?

Accepted Answer

$$T = 2\pi\sqrt{\frac{I}{mgd}}$$

Question 6

Which equation gives the magnetic field strength at a distance $$r$$ from a long straight wire carrying current $$I$$?

Accepted Answer

$$B = \frac{\mu_0$ I}{2\pi r}$$

Question 7

What happens to two parallel wires carrying current in the same direction?

Accepted Answer

They attract each other.

Question 8

The magnetic field inside a long solenoid with $$n$$ turns per unit length and current $$I is $$given by:

Accepted Answer

$$B = \mu_0$ n I$$

Question 9

A charged particle with charge $$q$$ and velocity $$v$$ moves perpendicular to a magnetic field $$B. $$What is the magnitude of the force on the particle?

Accepted Answer

$$F = qvB$$

Question 10

Which of the following best describes the path of a charged particle moving in a uniform magnetic field with velocity not perpendicular to the field?

Accepted Answer

It moves in a spiral (helix) along the field lines.

Question 11

What is the formula for magnetic flux $$\phi_B$$ through a loop of area $$A in a $$magnetic field $$B at $$angle $$	heta$$?

Accepted Answer

$$\phi_B = BA\cos	heta$$

Question 12

According to Faraday's Law, the induced emf in a coil with $$N$$ turns is:

Accepted Answer

$$\mathcal{E} = -N \frac{\Delta \phi}{\Delta t}$$

Question 13

Lenz's Law states that:

Accepted Answer

The induced current creates a magnetic field that opposes the change in magnetic flux.

Question 14

A conducting bar of length $$l$$ moves with velocity $$v$$ perpendicular to a magnetic field $$B. $$What is the induced emf?

Accepted Answer

$$\mathcal{E}_{motional} = Blv$$

Question 15

In a transformer, the ratio of primary to secondary voltage is equal to:

Accepted Answer

$$\frac{V_p}{V_s} = \frac{N_p}{N_s}$$

Question 16

Which of the following is true for an ideal transformer?

Accepted Answer

$$V_p I_p = V_s I_s$$

Question 17

Which method is used to reduce power losses in real transformers?

Accepted Answer

Using a laminated core to decrease eddy currents.

Question 18

Why are step-up transformers used in the National Grid System?

Accepted Answer

To increase voltage and reduce current, minimizing power losses during transmission.

Question 19

A spring-mass system has amplitude $$A. If $$the amplitude is doubled, what happens to the total energy?

Accepted Answer

It increases by a factor of 4.

Question 20

Which of the following statements about resonance in SHM is correct?

Accepted Answer

Resonance occurs when an external force is applied at the natural frequency, increasing the amplitude.

Oscillations and Electromagnetism: Study Notes for PHY60A (Grade 11 ASP Physics)

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