The magnetic field shown is produced by two north poles a south pole and non-mag

Question

The magnetic field shown is produced by two north poles a south pole and non-magnetized iron bar two south poles a north pole and a south pole When the wavelength of light is doubled, its frequency doubles frequency and speed are doubled energy doubles speed is unchanged but frequency is halved. The similarity between microwave and x - ray is that both have the same wavelength both have the same energy both have the same speed in vacuum both have the same frequency. A current-carrying wire is in a magnetic field with the direction of the current the same as that of the field. The wire tends to move parallel to the field The wire tends to move perpendicular to the field The wire tends to turn until it is perpendicular to the field The wire has no tendency to move or to turn The current in a 12 - Pi toaster operated at 144 V is 12 A 10 A 228 A 240 A The voltage needed to produce a current of a 2 A in a resistance of 40 pi is 20 V 39..5 V 40.5 V 80 V The resistance of a light bulb that draws a current of 2 A when connected to a 9-V battery is 18 pi 11 pi 7 pi 45 pi The current in a 600-W 240-V electric cooker is A 4 A 2.5 A 3 A

Explanation / Answer

24. Two similar magnetic poles repels so the field shown is due to two north poles bcoz the field is leaving the poles

25. speed = frequency*wavelenght = constant

if wavelenght is doubled then frequency will halved

26. option c

27. when current is in the direction of the magnetic field then no force will act

28. I = V/R = 144/12 = 12 A

29. V = IR = 80 volt

30. R = V/I = 4.5 ohm

31. I = P/V = 600/240 = 2.5 A

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