01). A circular loop of wire with a radius of 20 cm lies in the xy plane and car

Question

01). A circular loop of wire with a radius of 20 cm lies in the xy plane and carries a current of 2 A, counterclockwise when viewed from a point on the positive z axis. Its magnetic dipole moment is:
A) 0.25 A ·m2, in the positive z direction
B) 0.25 A ·m2, in the negative z direction
C) 2.5 A ·m2, in the positive z direction
D) 2.5 A ·m2, in the negative z direction
E) 0.25 A·m2, in the xy plane

02). The electric field at a distance of 10 cm from an isolated point charge of 2x10-9 C is:
A) 1.8 N/C
B) 18 N/C
C) none of these
D) 180 N/C
E) 1800 N/C

03). The magnetic field (in T) a distance 2 cm from a long straight wire carrying a current of 2 A is about:

Explanation / Answer

2)distance d=0.1m charge is q=2 x 10-9 C then the electric field is E=kq/r2    =(9 x 109)(2 x 10-9)/0.12 =1800 N/C AS per Cramster there should be only one Question per post so please post other Question seperately =1800 N/C AS per Cramster there should be only one Question per post so please post other Question seperately

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