The magnetic field shown is produced by A. two north poles B. a north pole and a

Question

The magnetic field shown is produced by A. two north poles B. a north pole and a south pole C. two south poles D. a south pole and an non-magnetized iron bar. A magnet does not exert a force on A. an non-magnetized iron bar B. a magnetized iron bar C. a stationary electric charge D. a moving electric charge The magnetic field lines around a long, straight current are A. straight lines parallel to the current B. straight lines that radiate from the current like spokes of a wheel C. concentric circles around the current D. concentric helixes around the current The current in a 12-Ohm toaster operated at 240 V is A 0.05 A B. 10 A C. 20 A D, 220 A The resistance of a light bulb that draws a current of 0.2 A when connected to a 12-v battery is A. 1.67 Ohm B. 2 Ohm C. 6 Ohm D. 60 Ohm A drawing of the field lines of magnetic field provides information on A. the direction of the field only B. the strength of the field only C. both the direction and the strength of the field D. the source of the field

Explanation / Answer

10.

A) two north poles

Reason : like poles repel each other. the magnetic field lines repel each other from the diagram. also the magnetic field lines are originating at the pole and going out which happen in north pole only.

11.

C

Reason : Only a moving charge experience magnetic force as per the formula

F = q (v x B)

12. C

13.

R = resistance = 12 ohm

V = Voltage = 240 volts

using ohm's law

i = V/R = 240/12 = 20 ohm

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