B) south C) east D) west E) the compass will act as an electric motor, hence the

Question

B) south C) east D) west E) the compass will act as an electric motor, hence the needle will keep rotating S. Two orce perailel wires, 4 em apart, carry currents of 2 A and 4 A respectively, in the same direction. The force per unit length of one wire on the other is: A) 1 B) 10.3 N/m, repulsive I 10-3 N/m, attractive C) 4 × 10.5 N/m, repulsive D) 4 x 10- N/m, attractive E) none of these Two long ideal solenoids (with radi 20 mm and 30 mm respectively) have the same number of turns re per unit length. The smaller solenoid is mounted inside the larger, along a common axis. It is observed that there is zero magnetic field within the inner solenoid. The current in the inner solenoid must be: A) two-thirds the current in the outer solenoid B) one-third the current in the outer solenoid C) twice the current in the outer solenoid D) half the current in the outer solenoid E) the same as the current in the outer solenoid The normal to a certain 1.0 m2 area makes an angle of 60° with a uniform magnetic field. The tho flur throush a second area that is perpendicu

Explanation / Answer

5) force per unit length = mu_0*I1*I2/(2*pi*r)

r = seperation between wires = 4 cm = 0.04 m

force per unit length = 4*pi*10^-7*2*4/(2*pi*0.04) = 4*10^-5 N/m attractive

OPTIOn (D)

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magnetic field due to current in inner solenoid Binner = uo*n*Iinner

magnetic field due to current in outer solenoid Bouter = uo*n*Iouter

given Bnet = 0

Binner - Bouter = 0

uo*n*Iinner = uo*n*Iouter

Iinner = Iouter

OPTIOn (E)

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