## F.Sc ICS Notes: Physics XII: Chapter 14 Electromagnetism Numerical Problems

__Find the value of the magnetic field that will cause a maximum force of 7 * 10(-3) N on a 20cm straight wire carrying current of 10 A.__

**Numerical Problem 14.1:**__How fast must a proton move in a magnetic field 2.5 * 10(-3) T such that the magnetic force is equal to its weight?__

**Numerical Problem 14.2:**__A velocity selector has a magnetic field of 0.3T. If a perpendicular electric field of 10000V/m is applied, what will be the speed pf the particle that will pass through the selector?__

**Numerical Problem 14.3:**__A coil of 0.1m * 0.1m and of 200 turns carrying a current of 1 mA is placed in a uniform magnetic field of 0.1T. Calculate the maximum torque that acts on the coil.__

**Numerical Problem 14.4:**__A power line 10m high carries a current 200A. Find the magnetic field of the wire at the ground.__

**Numerical Problem 14.5:**__You are asked to design a solenoid that will give a magnetic field of 0.1 T, yet the current must not exceed 10 A. Find the number of turns per unit length that the solenoid should have.__

**Numerical Problem 14.6:**__What current should pass through a solenoid that is 0.5m long with 10000 turns of copper wire so that it will have a magnetic field of 0.4T.__

**Numerical Problem 14.7:**__A galvanometer having an internal resistance Rg = 15 ohm gives full scale deflection with current Ig = 10 mA. It is to be converted into an ammeter of range 10 A. Find the value of shunt resistance Rs?__

**Numerical Problem 14.8:**__The resistance of galvanometer is 50 ohm and reads full-scale deflection with a current of 2mA. Shown by a diagram on book how to convert this galvanometer into a voltmeter reading 200V full scale.__

**Numerical Problem 14.9:**__The resistance of galvanometer coil is 10 ohm and reads full scale with a current of 1 mA. What should be the values of resistance R1, R2, and R3 to convert this galvanometer into a multi-range ammeter of 100, 10, and 1A as shown in figure on book.__

**Numerical Problem 14.10:**
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