Question

Given a 5cm tall object and that do is 30 and di is 45 what is the height of the image. a. 3.3cm b. -7.5cm c. -1.5cm d. 7.5cm

A magnetic assembly is placed on a scale, the change in mass when a current carrying wire is placed between the magnetic poles reads 0.030kg. Given that the length of the wire is 10cm and the current is 4A what is the magnetic strength of the magnetic assembly.

	a.	0.00736T
	b.	0.736T
	c.	0T
	d.	0.075T

1. A high power lens will be _________ and have __________ focal length

   	a.	Thinner / Longer
   	b.	Thinner / Shorter
   	c.	Thicker / Longer
   	d.	Thicker / Shorter

2.5 points   

QUESTION 20

1. Given that a graph of Current vs Voltage is a straight line, what does the slope of the line represent?

   	a.	1/Resistance
   	b.	Resistance
   	c.	Voltage/Current
   	d.	Electric Potential

Answer 1

di ho lhe a do & d; = +45 cm di m= ho Now, given that ho=5cm do=-30cm thus, magnification, hi=ho. do thus, height of image, he = -7.5 cm di 5x 45 -7.5cm -30 (2 of Here, Due to current carrying wire in presence of magnetic field, change in experiences a force F due to which there is man on scale. Let change in mans is mi. Thus, F=mg = (0.030 kg) (9.81 m/s2) -> F= 0.2943 N. Now, force current carrying wire in presence of 'B' magnetic field is on

F-BIL 0.2943 = 3x4x (10x10-2 m) thus, -) B = 0.2943 = 0.73575 T 4x ool ie, B 7 0.736 T f Power of lens & focal length (f) And where Reradius of curvature. Now, for highen bower = f should be lower. And for lower of radius of curvature should be tower = lens in thicker. Thus, a high power lens will be thicken and have shorten focal length: slope of line F Current (I) voltage (V) thus, slope of line represents = resistance 1