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Physics problems: magnetism

Part 8

 

Problem 71.

A 5-cm long solenoid has 2000 turns. Calculate its inductance. The diameter of the solenoid is 5 mm.

Solution

 

Problem 72.

A 100-turn 10-cm-diameter solenoid is placed in a 0.01 T magnetic field, which is parallel to the axis of the solenoid. The solenoid rotates solenoid in 5 seconds. Calculate the average emf generated across the solenoid.

Solution

 

Problem 73.

A 50 mH inductor is connected to a 20 V battery at zero moment of time. Find the current in the circuit at t=0.1 s. Neglect the resistance of the circuit and the internal resistance of the battery.

Solution

 

Problem 74.

A 100 mH inductor is connected to ideal 10 V battery at t=0. Find the moment of time when the current in the circuit is 0.5 A. Neglect the resistance of the circuit.

Solution

 

Problem 75.

What is the magnitude of a torque on a square loop shown in the figure?

 

current

Solution

 

 

 

 

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