NCERT Exemplar III — task. Science CBSE, Class 10.

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1. A uniform magnetic field exists in the plane of paper pointing from left to right as shown in Figure. In the field an electron and a proton move as shown. The electron and the proton experience

forces both pointing into the plane of paper
forces both pointing out of the plane of paper
forces pointing into the plane of paper and out of the plane of paper, respectively
force pointing opposite and along the direction of the uniform magnetic field respectively

2. Commercial electric motors do not use

effectively large number of turns of conducting wire in the current carrying coil
an electromagnet to rotate the armature
a permanent magnet to rotate the armature
a soft iron core on which the coil is wound

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39. NCERT Exemplar III

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