Physics Test 19...

A current loop in a magnetic field

A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It

A bar magnet of magnetic moment M is placed at right angles to a magnetic induction B. If a force F is experienced by each pole of the magnet, the length of the magnet will be

Electromagnets are made of soft iron because soft iron has

A short bar magnet of magnetic moment 0.4JT⁻¹ is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is

A battery of internal resistance 2 Ω is connected to a variable resistor whose value can vary from 4 Ω to 10 Ω .The resistance is initially set at 4 Ω. If the resistance is now increased then

The maximum current that can be measured by a galvanometer of resistance 40 Ω is 10 mA. It is converted into a voltmeter that can read upto 50 V. The resistance to be connected is series with the galvanometer (in ohm) is

Two identical bar magnets are fixed with their centres a ta distance d apart. A stationary charge Q is placed at P in between the gap of the two magnets at a distance D from the centre O as shown in the figure

A bar magnet having a magnetic moment of 2×10⁴JT⁻¹ is free to rotate in a horizontal plane. A horizontal magnetic field B = 6×10⁻⁴T exists in the space. The work done in taking the magnet slowly from a direction parallel to the field to a direction 60° from the field is

Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show