Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

A steel plate of face area 4cm² and thickness 0.5cm is fixed rigidly at the lower surface. A tangential force of 10N is applied on the upper surface. Find the lateral displacement of the upper surface with respect to the lower surface. Rigidity modulus of steel = 8.4 × 10¹⁰N/m².

How does the electric flux due to a point charge enclosed by a spherical Gaussian surface get affected when its radius is increased?

How is the speed of em-waves in vacuum determined by the electric and magnetic field?

Write the formula for the magnifying power of a objective lens.

To measure the magnetic moment of a bar magnet, one may use:

1. A tangent galvanometer.
2. A deflection galvanometer if the earth's horizontal field is known.
3. An oscillation magnetometer if the earth's horizontal field is known.
4. Both deflection and oscillation magnetometer if the earth's horizontal field is not known.

Answer the following questions, which help you understand the difference between Thomson’s model and Rutherford’s model better.
Is the probability of backward scattering (i.e., scattering of α-particles at angles greater than 90°) predicted by Thomson’s model much less, about the same, or much greater than that predicted by Rutherford’s model?

Name the logic gate whose repetitive use can make digital circuits.

Can a charged particle be accelerated by a magnetic field? Can its speed be increased?

The I-V characteristics of a resistor are observed to deviate from a straight line for higher values of current as shown in the adjoining figure why?

If the intensity of incident radiation is increased in a photoelectric cell, how will the stopping potential change?