Electromagnetic Induction — Physics STD 12 Science — Question

An electron and a proton are both released from rest 1 meter from a large stationary negative charge, considering only the force from the large stationary negative charge on the proton and electron. Which of the following is true?

In image formation from spherical mirrors, only paraxial rays are considered because they:

What is the space around a current-carrying conductor, in which its magnetic effect can be experienced called?

Television signals on earth cannot be received at distances greater than 100 km from the transmission station. The reason behind this is that(a) The receiver antenna is unable to detect the signal at a distance greater than 100 km(b) The TV programme consists of both audio and video signals(c) The TV signals are less powerful than radio signals(d) The surface of earth is curved like a sphere

As the temperature of a metallic resistor is increased, the product of its resistivity and conductivity:

1. Increases.
2. Decreases.
3. Remains constant.
4. May increase or decrease.

A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when:

At a point 20 cm from the centre of a uniformly charged dielectric sphere of radius 10 cm, the electric field is 100 V/m. The electric field at 3 cm from the centre of the sphere will be(a) 150 V/m(b) 125 V/m(c) 120 V/m(d) Zero