Current Electricity — Physics STD 12 Science — Question

How does the electric field due to point charge and line charge change with distance?

A steady current is flowing in a cylindrical conductor. Does electric field exist within the conductor?

If length of a wire of resistivity p is stretched to three times, then what will be new resistivity?

Write any two properties of electric field lines.

Can the peak voltage across the inductor be greater than the peak voltage of the source in an LCR circuit?

What is the relation between produced magnetic field at the center of a circular current carrying coil and its radius?

The length of the string of a simple pendulum is measured with a metre scale to be 90.0cm. The radius of the bob plus the length of the hook is calculated to be 2.13cm using measurements with a slide callipers. What is the effective length of the pendulum? (The effective length is defined as the distance between the point of suspension and the centre of the bob.)

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.

Choose the correct alternative from the clues given at the end of the each statement:
In the ground state of .......... electrons are in stable equilibrium, while in .......... electrons always experience a net force. (Thomson’s model/ Rutherford’s model.)