A line charge λ per unit length is lodged uniformly onto the rim of a wheel of mass M and radius R. The wheel has light non-conducting spokes and is free to rotate without friction about its axis (Below Fig.). A uniform magnetic field extends over a circular region within the rim. It is given by,

A line charge λ per unit length is lodged uniformly onto the rim of a wheel of mass M and radius R. The wheel has light non-conducting spokes and is free to rotate without friction about its axis (Below Fig.). A uniform Read More …

An air-cored solenoid with length 30 cm, area of cross-section  25 cm2 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.

An air-cored solenoid with length 30 cm, area of cross-section  25 cm2 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 Read More …

Figure 6.20 shows a metal rod PQ resting on the smooth rails AB and positioned between the poles of a permanent magnet. The rails, the rod, and the magnetic field are in three mutual perpendicular directions. A galvanometer G connects the rails through a switch K. Length of the rod = 15 cm, B = 0.50 T, resistance of the closed loop containing the rod = 9.0 mΩ. Assume the field to be uniform. a) Suppose K is open and the rod is moved with a speed of 12 cm s−1 in the direction shown. Give the polarity and magnitude of the induced emf.

Figure 6.20 shows a metal rod PQ resting on the smooth rails AB and positioned between the poles of a permanent magnet. The rails, the rod, and the magnetic field are in three mutual perpendicular directions. A galvanometer G connects the rails Read More …

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