Physics Mid Exam for Grade 10

A proton of charge 1.6×10−19C travels at 30m/s at right angles to magnetic field exerts a magnetic force of 4.8×10−3N. What is magnetic field strength produced by proton?

A solenoid has 200 turns per meter and 60A current flowing through it. Calculate the magnetic field strength created by solenoid?

The primary has 2000 turns and the secondary has 100 turns. The voltage across the output is 140 V. Determine the voltage across input terminals of a transformer?

Which one of the following is not example of magnetic material

• Nickel

• Cobalt

• Iron

• Plastic

When domains are arranged lined up become magnetized and arranged randomly loss magnetization.

• True

• False

A region where a magnetic force may be exerted between magnetic materials is called magnetic flux.

• True

• False

What will happen the force between two parallel current carrying wire flows in the opposite way?

• attract each other

• repeal each other

• attract & repeal each other

• have no effect

Lenz's law states that the induced emf in a closed loop is directly proportional to the rate of change of magnetic flux in the loop.

• True

• False

If the number of turns in the primary coil is greater than the number of turns in the secondary coil the transformer is called step down transformer.

• True

• False

magnetic field on a current carrying conductor depends on all except one

• magnetic force, F

• current flowing, I

• length of current carrying wire, L

• magnetic flux, Ф