A closely wound solenoid of 800 turns and area of cross section `2.5 times 10^-4 m^2` carries a current of 3.0A. Explain the sense in which the solenoid acts like a bar magnet.

A closely wound solenoid of 800 turns and area of cross section 25 xx 10^(-4)m^(2) carries a current of 3.0 A. Explain the sense in which the solenoid acts like a bar magnet. What is its associated magnetic moment?

A closely wound solenoid of 2000 turns and area of cross-section 1.6 xx 10^(-4)m^(2)? carrying a current of 4.0 A. is suspended through its centre allowing it to turn in a horizontal plane. (a) What is the magnetic moment associated with the solenoid? (b) What is the force and torque on the solenoid if a uniform horizontal magnetic field of 7.5 xx 10^(-2)T is set up at an angle of 30^@ with the axis of the solenoid?

An air-cored solenoid with length 30 cm, area of cross-section 25 "cm"^2 and number of turns 500, carries a current of 2.5 A. The current is suddenly switched off in a brief time of 10^(-3) s. How much is the average back emf induced across the ends of the open switch in the circuit ? Ignore the variation in magnetic field near the ends of the solenoid.

If 10^(6) electrons/s are flowing through an area of cross section of 10^(-4) m^(2) then the current will be:-

If 2×10^(6) electrons/s are flowing through an area of cross section of 2×10^(-4) m^(2) then the current will be:-

If 2 ×10^(6) electrons/s are flowing through an area of cross section of 10^(-4) m^(2) then the current will be:-

A solenoid of length 0.4 m has a radius of 1 cm and is made up of 500 turns. It carries a current of 10 A. What is the magnitude of the magnetic field inside the solenoid ?

What is the self inductance of a solenoid of length 31.4 cm., area of cross section 10^(-3) m^2 and total number of turns 10^3 ?