Current Electricity — Physics STD 12 Science — Question

Out of gravitational, electromagnetic, Vander Waals, electrostatic and nuclear forces; which two are able to provide an attractive force between two neutrons (a) Electrostatic and gravitational(b) Electrostatic and nuclear(c) Gravitational and nuclear(d) Some other forces like Vander Waals

Two identical conductors of copper and aluminium are placed in an identical electric fields. The magnitude of induced charge in the aluminium will be(a) Zero  (b) Greater than in copper(c) Equal to that in copper(d) Less than in copper

Magnetic force required to demagnetize the material:

A tangent galvanometer is connected directly to an ideal battery. If the number of turns in the coil is doubled the deflection will:

A magnetic needle suspended by a silk thread is vibrating in the earth's magnetic field. If the temperature of the needle is increased by 500°C, then(a) The time period decreases(b) The time period remains unchanged(c) The time period increases(d) The needle stops vibrating

 The formula for electrostatic potential is _____________.

A magnet of magnetic moment M is rotated through 360° in a magnetic field H, the work done will be(a) MH(b) 2MH(c) 2πMH(d) Zero

The magnetism of magnet is due to(a) The spin motion of electron(b) Earth(c) Pressure of big magnet inside the earth(d) Cosmic rays

de-Broglie hypothesis treated electrons as(a) Particles(b) Waves(c) Both ‘a’ and ‘b’(d) None of these