Advertisements
Advertisements
Question
State three ways in which the strength of an electromagnet can be increased.
Solution
Strength of an electromagnet can be increased in the following three ways:
1. By increasing the number of turns in the coil of the electromagnet
2. By increasing the flow of current in the coil of the electromagnet
3. By reducing the length of air gap between the poles of the electromagnet
APPEARS IN
RELATED QUESTIONS
State Fleming’s right-hand rule.
The phenomenon of electromagnetic induction is
Prove theoretically (electromagnetic induction) `e = (dphi)/(dt)`
How is the working of an electric bell affected, if alternating current be used instead of direct current?
A light metal disc on the top of an electromagnet is thrown up as the current is switched on. Why? Give reason.
A conducting square loop having edges of length 2.0 cm is rotated through 180° about a diagonal in 0.20 s. A magnetic field B exists in the region which is perpendicular to the loop in its initial position. If the average induced emf during the rotation is 20 mV, find the magnitude of the magnetic field.
Obtain an expression for motional emf from Lorentz force.
A straight metal wire crosses a magnetic field of flux 4 mWb in a time 0.4 s. Find the magnitude of the emf induced in the wire.
A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis, then ____________.
