MCQ
To make the field radial in a moving coil galvanometer
- AThe number of turns in the coil is increased
- BMagnet is taken in the form of horse-shoe
- ✓Poles are cylindrically cut
- DCoil is wounded on aluminium frame
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Assertion $A$ : The photoelectric effect does not take place, if the energy of the incident radiation is less than the work function of a metal.
Reason $R$ : Kinetic energy of the photoelectrons is zero, if the energy of the incident radiation is equal to the work function of a metal.
In the light of the above statements, choose the most appropriate answer from the options given below