Question 1

A point charge $$q is $$placed at the origin. What is the electric field at a distance $$r$$ from the charge?

Accepted Answer

$$E = \frac{q}{4\pi\$$epsilon_0$$ r^2$}$$

Question 2

Which of the following best describes the relationship between electric potential ($$V) $$and electric field ($$E$$)?

Accepted Answer

$$E = -
abla V$$

Question 3

A parallel plate capacitor is charged to a voltage $$V$$ and then disconnected from the battery. If the plates are pulled apart to double their separation, what happens to the energy stored in the capacitor?

Accepted Answer

The energy doubles.

Question 4

Which equation correctly relates capacitance ($$C$$), charge ($$Q$$), and voltage ($$V) $$for a capacitor?

Accepted Answer

$$Q = CV$$

Question 5

In an RC circuit, the time constant $$	au is $$given by:

Accepted Answer

$$	au = RC$$

Question 6

A wire carries a current $$I in a $$magnetic field $$B. $$What is the force per unit length on the wire if it is perpendicular to the field?

Accepted Answer

$$F/L = IB$$

Question 7

Which law explains the induced emf in a loop due to changing magnetic flux?

Accepted Answer

Faraday's Law: $$\mathcal{E} = -\frac{d\Phi_B}{dt}$$

Question 8

A light ray passes from air into glass. If the angle of incidence is $$30^\circ$$ and the refractive index of glass is $$1.5$$, what is the angle of refraction?

Accepted Answer

$$\$$theta_2$$ = \arcsin\left(\frac{\sin 30^\circ}{1.5}\right)$$

Question 9

Which equation gives the energy of a photon with wavelength $$\lambda$$?

Accepted Answer

$$E = \frac{hc}{\lambda}$$

Question 10

In the photoelectric effect, what happens if the frequency of incident light is below the threshold frequency?

Accepted Answer

No electrons are emitted.

Question 11

The De Broglie wavelength of a particle with momentum $$p is$$:

Accepted Answer

$$\lambda = \frac{h}{p}$$

Question 12

Which of the following is a property of ionizing radiation?

Accepted Answer

It can remove electrons from atoms.

Question 13

Einstein’s first postulate of special relativity states:

Accepted Answer

The laws of physics are the same in all inertial frames.

Question 14

A spaceship travels at $$0.8c$$ relative to Earth. What is the time dilation factor?

Accepted Answer

$$\gamma = \frac{1}{\sqrt{1 - (0.8)^2$}}$$

Question 15

Which equation describes the relationship between energy and mass in special relativity?

Accepted Answer

$$E = mc^2$

Question 16

A circuit contains a resistor ($$R$$), capacitor ($$C$$), and battery ($$V). $$What is the voltage across the capacitor after a long time?

Accepted Answer

Equal to the battery voltage $$V$$

Question 17

Which phenomenon is responsible for the bright and dark fringes in a double-slit experiment?

Accepted Answer

Interference

Question 18

A lens forms a real image of an object. Which statement is true about the image?

Accepted Answer

The image is inverted and can be projected onto a screen.

Question 19

Which equation describes the magnetic field at the center of a circular loop of radius $$R$$ carrying current $$I$$?

Accepted Answer

$$B = \frac{\mu_0$ I}{2R}$$

Physics II: Electricity, Magnetism, Optics, and Modern Physics – Course Structure and Key Concepts

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