Describe what is the cause of the magnetic field of the Earth. Describe what is meant by magnetic field strength and state its unit of measurement. Select one or more: O a. The magnetic field of the earth is caused by Earth's rotation around the Sun. O b. The magnetic field strength B is the value of the current in the loop per unit area. O c. Magnetic field strength is measured in amperes per meter squared. O d. The magnetic field strength B is defined as the force acting per unit current in a wire of unit length when the wire is perpendicular to the magnetic field lines. O e. Magnetic field strength is measured in Tesla. O f. The magnetic field of the earth is caused by electric currents inside the molten iron core of the Earth.

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Which relations below regarding magnetic field and electric field lines are true? 1. Magnetic field lines never begin nor end but always loop around on themselves while electric field lines begin at negative charges and end at positive charges. 2. Magnetic field lines never begin nor end but always loop around on themselves while electric field lines begin at positive charges and end at negative charges. 3. Magnetic field lines come out of north poles outside the magnet and into north poles inside the magnet. Magnetic field lines go into south poles outside the magnet and out of south poles inside the magnet. Electric field lines begin at positive charges and end at negative charges. 4. Magnetic field lines begin at north poles and end at south poles while electric field lines loop around on themselves. 5. Magnetic field lines begin at south poles and end at north poles while electric field lines loop around on themselves. 1 and 4 2 and 5 2 and 4 1 and 3 1 and 5 2 and 3