List of practice Questions

Obtain the formula for the resultant magnetic moment of the two concentric circular coils of radius \( r \), placed perpendicular to each other on passing the same current \( i \).
What are electromagnetic waves? Explain, with the help of a diagram, that these waves are transverse in nature.
Draw a labelled ray diagram of a compound microscope, when final image is formed at infinity. On which factors does the magnifying power of the microscope depend?
Energy level diagram of a certain atom is shown in the figure. The wavelength obtained in the emission transitions from level C to A is 1000 Å, and from C to B is 5000 Å. Calculate the wavelength emitted in the transition from B to A.
The length of wingspan of an aeroplane is \( L \) meters and it is flying with a velocity of \( v \, \text{m/s} \) from north towards south. If the horizontal component of Earth's magnetic field is \( H \, \text{weber/m}^2 \) and induced e.m.f. produced between the ends of the wingspan is \( e \, \text{volt} \), then obtain the expression for the angle of dip at that place.
The resistance of wire AB as shown in the figure is \( 12000 \, \Omega \) and \( 220 \, \text{V} \) of potential difference is applied across it. Resistance of voltmeter \( V \) is \( 6000 \, \Omega \). The point C is at one-fourth distance from the point A. What is the reading of the voltmeter?
The capacitance of a charged capacitor is \( C \) farad and stored energy is \( U \) joule. Write the expression for charge on the plates of the capacitor.
What is the photoelectric effect?
Write down the majority and minority charge carriers in n-type of semiconductor.
What is the effect on the null deflection length on decreasing the value of potential gradient in the wire of potentiometer?
How is a galvanometer converted into a voltmeter?
What will be the angle of minimum deviation by a thin prism of 10° and refractive index 2?
In Young's double-slit experiment, the ratio of maximum and minimum intensity on the screen is 9:1. What should be the ratio of the width of the slits?
Resistance of a wire is \( 2 \, \Omega \). The radius of the wire is halved on stretching it. Find out the new resistance of the wire.
State Biot-Savart law. Find the expression for the magnetic field due to a current carrying circular loop at its centre. Also, write down the formula for the magnetic moment of this current loop.
Write down the relationship between root-mean-square value and peak value of an alternating voltage. In the given circuit, find the value of inductive reactance and the potential difference between the ends of the resistance.

An electron, which has charge \( e \) and mass \( m \), is moving in a uniform electric field \( E \). Its acceleration is:
Equivalent resistance of three identical resistors in series is \( R_1 \) and in parallel it is \( R_2 \). If \( R_1 = nR_2 \), then the minimum possible value of \( n \) is:
The radius of the circular path of a charged particle in a uniform magnetic field is directly proportional to the:
In order to obtain an output, Y = 1, from the given combination of gates:
In the given nuclear reaction, X is:
\[ ^7_1N + ^1_0n \longrightarrow ^6_1C + X \]
A plane electromagnetic wave represented as \( E = 100 \cos (6 \times 10^8 t + 4x) \, \text{V/m} \), is propagated through a medium of refractive index:
Give the relationship of temperature with the resistance and resistivity of a conductor. Define the temperature coefficient of the resistance and give its unit.
What is the photoelectric effect? For any photosensitive surface, the threshold frequency is \( 3.3 \times 10^{14} \, \text{Hz} \). If the frequency of incident light becomes \( 8.2 \times 10^{14} \, \text{Hz} \), then calculate the stopping potential and give the value of the work function of the surface also.
What is the photoelectric effect? For any photosensitive surface threshold frequency is \( 3.3 \times 10^{14} \, \text{Hz} \). If frequency of incident light becomes \( 8.2 \times 10^{14} \, \text{Hz} \), then calculate the stopping potential and give the value of work function of the surface also.