XII Physics Worked Examples | Ch# 18 Magnetic Fields

Описание: Board: Sindh Boards
Class : 12, Second Year
Subject: Physics
Unit #18 Magnetic Fields
Worked Example 18.1 : A current carrying conductor of certain length placed at 90° to the magnetic field experiences a force F. What will be the force if the current is increased four times, length is halved and magnetic field is tripled?
Worked Example 18.2 : A conductor of length 50cm carrying a current of 5A is placed perpendicular to a magnetic field of induction 2x10-3 T. Find the force on the conductor.
Worked Example 18.3 : Calculate the magnetic flux through a rectangular loop with dimensions 5 cm x 10 cm placed in a magnetic field of strength 0.2 T. The loop is oriented such that the magnetic field lines are perpendicular to the plane of the loop.
Worked Example 18.4 : Suppose we have a solenoid with 500 turns per meter and a current of 2.5 amperes flowing through it. Calculate the magnetic flux density inside the solenoid.
Worked Example 18.5 : Suppose we have a toroid with 1000 turns and a current of 3 amperes flowing through it. The toroid has a circular cross-section with a radius of 0.1 meters. Calculate the magnetic flux density inside the toroid.
Worked Example 18.6 : A moving coil galvanometer of resistance 100ohm is used as an ammeter using a Shunt of 0.1ohm. The maximum deflection current in the galvanometer is 100RA. Find the current in the circuit so that the ammeter gives maximum deflection.
Worked Example 18.7 : A galvanometer coil of 40 ohm resistance shows full range deflection for a current of 4mA. How can this galvanometer be converted into a voltmeter of range 0-12V?